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Initial Defense Communications Satellite Program
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| IDCSP | DSCS-2 |
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Initial Defense Communications Satellite Program
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| IDCSP | DSCS-2 |
This page contains philatelic information on the US Air Force (USAF) Initial Defense Communications Satellite Program (IDCSP) and Defense Satellite Communications System (DSCS) series. Catalog numbers, years of issue, and notes on the satellites featured are given when available. If readers know of additional information or images, please contact the authors using the e-mail addresses at the bottom of this page.
IDCSP or DSCS-1 were also known as NATO-1 series satellites.
| Launch information (found elsewhere) |
Launch covers (including anniversary-of-launch covers, and launch-related event covers) (farther below) |
Other postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.) (immediately below) |
|---|---|---|
| IDCSP (USAF) | IDCSP (USAF) | IDCSP (USAF) |
| IDCSP (on other than IDCSP launch covers) | ||
| DSCS (USAF) | DSCS (USAF) | DSCS (USAF) |
| DSCS (on other than DSCS launch covers) |
Below is a list of IDCSP and DSCS-series postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.).
| Country | Catalog Number | Type of Item | Year of Issue | Notes on Content |
|---|---|---|---|---|
| Initial Defense Communications Satellite Program (IDCSP) (USAF) | ||||
| No (non-launch cover) postal items found | ||||
| Defense Satellite Communications System (DSCS) (USAF) | ||||
| Finland | 1478c (Mi2337) | From booklet pane of 6 on page2 (1478) (Mi MH(2335-2340)-Blatt), with detail; also booklet front, booklet back, booklet inside page1, and booklet inside showing stamp shapes | 1975 | DSCS-3 |
| Finland | 1478 fdc | Booklet pane of 6 on FDC, also back | ||
Below is a list of IDCSP and DSCS-series launch covers (including anniversary-of-launch covers, and launch-related event covers).
| Country | Cancel Date | Cancel Location | Type of Item | Notes on Content |
|---|---|---|---|---|
| Initial Defense Communications Satellite Program (IDCSP) (USAF) | ||||
| 1966-06-16: IDCSP-1/7 (and GGTS-1) | ||||
| United States | 1966-06-16 | Cape Canaveral FL | (SpaceCraft/Swanson) cachet on cover, also insert | IDCSP-1/7 launch |
| United States | 1966-06-16 | Patrick AFB, FL | (SpaceCraft/Swanson) cachet on cover, also insert | IDCSP-1/7 launch |
| United States | 1966-06-16 | Cape Canaveral FL | (Astro Covers, no logo) cachet on cover | IDCSP-1/7 launch |
| United States | 1966-06-16 | Cape Canaveral FL | (Astro Covers, no logo) cachet (different) on cover | IDCSP-1/7 launch |
| United States | 1966-06-16 | Cape Canaveral FL (hand cancel) | (Centennial) cachet (and black rubber-stamp note) on cover | IDCSP-1/7 launch |
| United States | 1966-06-16 | Cape Canaveral FL (hand cancel) | (Centennial) cachet (and typed note) on cover | IDCSP-1/7 launch |
| United States | 1966-06-16 | Cape Canaveral FL (machine cancel) | (Centennial) cachet on cover | IDCSP-1/7 launch |
| United States | 1966-06-16 | Patrick AFB, FL | (Sarzin) cachet on cover | IDCSP-1/7 launch |
| United States | 1966-06-16 | Cape Canaveral FL | (Swanson purple rubber-stamp) cachet on cover | IDCSP-1/7 launch |
| United States | 1966-06-16 | Kennedy Space Center FL | (Artopages) cachet on cover | IDCSP-1/7 launch |
| United States | 1966-06-16 | Kennedy Space Center FL | (Artopages) cachet (different) on cover | IDCSP-1/7 launch |
| United States | 1966-06-16 | Cape Canaveral FL | (Swanson purple and black rubber-stamp) cachet on (airmail) cover | IDCSP-1/7 launch |
| United States | 1966-06-16 | Cape Canaveral FL | (Orbit Covers, no logo) cachet on cover | IDCSP-1/7 launch |
| United States | 1966-06-16 | Cape Canaveral FL | (HJM black and black typed) cachet on cover | IDCSP-1/7 launch |
| United States | 1966-06-16 | Cape Canaveral FL | (Purple rubber-stamp) cachet on cover | IDCSP-1/7 launch |
| 1966-08-26: IDCSP-8/14 (and GGTS-2) [failed] | ||||
| United States | 1966-08-26 | Cape Canaveral FL (machine cancel) | (Centennial) cachet on cover | IDCSP-8/14 launch [failed] |
| United States | 1966-08-26 | Cape Canaveral FL (hand cancel) | (Centennial) cachet on cover | IDCSP-8/14 launch [failed] |
| United States | 1966-08-26 | Cape Canaveral FL | (Swanson purple rubber-stamp) cachet on cover | IDCSP-8/14 launch [failed] |
| United States | 1966-08-26 | Cape Canaveral FL | (Swanson purple rubber-stamp) cachet (slightly different) on cover | IDCSP-8/14 launch [failed] |
| United States | 1966-08-26 | Cape Canaveral FL | (HJM blue and Swanson purple rubber-stamp) cachets on cover | IDCSP-8/14 launch [failed] |
| United States | 1966-08-26 | Cape Canaveral FL | (Magenta rubber-stamp) cachet on cover | IDCSP-8/14 launch [failed] |
| 1967-01-18: IDCSP-8/15 | ||||
| United States | 1967-01-18 | Cape Canaveral FL | (SpaceCraft/Swanson red and pink and cyan) cachet on cover, also insert and back | IDCSP-8/15 launch |
| United States | 1967-01-18 | Cape Canaveral FL | (SpaceCraft/Swanson red and pink and pale-green) cachet on cover, insert | IDCSP-8/15 launch |
| United States | 1967-01-18 | Patrick AFB, FL | (SpaceCraft/Swanson red and pink and pale-green) cachet on cover, insert | IDCSP-8/15 launch |
| United States | 1967-01-18 | Patrick AFB, FL | (Sarzin?) cachet on cover | IDCSP-8/15 launch |
| United States | 1967-01-18 | Cape Canaveral FL | (Orbit Covers) cachet on cover | IDCSP-8/15 launch |
| United States | 1967-01-18 | Cape Canaveral FL (machine cancel) | (Centennial) cachet on cover | IDCSP-8/15 launch |
| United States | 1967-01-18 | Cape Canaveral FL (hand cancel) | (Centennial) cachet on cover | IDCSP-8/15 launch |
| United States | 1967-01-18 | Cape Canaveral FL | (Swanson/DuBeau? purple rubber-stamp) cachet on cover | IDCSP-8/15 launch |
| United States | 1967-01-18 | Kennedy Space Center FL | (Swanson/DuBeau? blue rubber-stamp) cachet (different) on cover | IDCSP-8/15 launch |
| United States | 1967-01-18 | Cape Canaveral FL | (HJM blue and Swanson purple rubber-stamp) cachets on cover | IDCSP-8/15 launch |
| United States | 1967-01-18 | Cape Canaveral FL | (Multi-color printed) cachet on cover | IDCSP-8/15 launch |
| United States | 1967-01-18 | Cape Canaveral FL | (Sokalsky green) cachet on cover | IDCSP-8/15 launch |
| United States | 1967-01-18 | Cape Canaveral FL | (Black typed) cachet on (airmail) cover | IDCSP-8/15 launch |
| 1967-07-01: IDCSP-16/19 (and DODGE and LES-5) | ||||
| United States | 1967-07-01 | Patrick AFB, FL | (SpaceCraft/Swanson) cachet on cover, also insert | IDCSP-16/19 launch |
| United States | 1967-07-01 | Cape Canaveral FL | (SpaceCraft/Swanson) cachet on cover, also insert | IDCSP-16/19 launch |
| United States | 1967-07-01 | Cape Canaveral FL | (Centennial orange rocket, type-1) cachet on cover | IDCSP-16/19 launch (Pioneer-3/4 type, Pioneer-5/Explorer-61, and Vanguard-2 depicted) |
| United States | 1967-07-01 | Cape Canaveral FL | (C. Swanson purple rubber-stamp) cachet on cover | IDCSP-16/19 launch |
| United States | 1967-07-01 | Cape Canaveral FL | (C. Swanson purple rubber-stamp) cachet (slightly different) on (airmail) cover | IDCSP-16/19 launch |
| United States | 1967-07-01 | Cape Canaveral FL | (C. Swanson purple and red rubber-stamp) cachet on cover | IDCSP-16/19 launch |
| United States | 1967-07-01 | Cape Canaveral FL | (C. Swanson purple and red and black rubber-stamp) cachet on cover | IDCSP-16/19 launch |
| United States | 1967-07-01 | Kennedy Space Center FL | (Black typed) cachet on cover | IDCSP-16/19 launch |
| United States | 1967-07-01 | Cape Canaveral FL | (Sarzin) cachet on cover | IDCSP-16/19 launch |
| United States | 1967-07-01 | Cape Canaveral FL | (Artopages?) cachet on cover | IDCSP-16/19 launch |
| Austria | 1967-07-03 | Krieglach | (Black and red typed) cachet on cover | IDCSP-16/19 launch |
| 1968-06-13: IDCSP-20/27 | ||||
| United States | 1968-06-13 | Cape Canaveral FL | (SpaceCraft/Swanson) cachet on cover, also insert | IDCSP-20/27 launch ("secret messages and reconnaissance photographs") |
| United States | 1968-06-13 | Patrick AFB, FL | (SpaceCraft/Swanson) cachet on cover, also insert | IDCSP-20/27 launch ("secret messages and reconnaissance photographs") |
| United States | 1968-06-13 | Cape Canaveral FL (machine cancel) | (Orbit Covers, no logo) cachet on cover | IDCSP-20/27 launch |
| United States | 1968-06-13 | Cape Canaveral FL (hand cancel) | (Orbit Covers, no logo) cachet on cover | IDCSP-20/27 launch |
| United States | 1968-06-13 | Cape Canaveral FL (machine cancel) | (Centennial) cachet on cover | IDCSP-20/27 launch |
| United States | 1968-06-13 | Cape Canaveral FL (hand cancel) | (Centennial) cachet on cover | IDCSP-20/27 launch |
| United States | 1968-06-13 | Cape Canaveral FL | (Whitney blue and magenta) cachet on cover | IDCSP-20/27 launch |
| United States | 1968-06-13 | Cape Canaveral FL (machine cancel) | (Swanson/DuBeau? magenta rubber-stamp) cachet on cover | IDCSP-20/27 launch |
| United States | 1968-06-13 | Cape Canaveral FL (hand cancel) | (Swanson/DuBeau? magenta and blue rubber-stamp) cachet on (airmail) cover | IDCSP-20/27 launch |
| United States | 1968-06-13 | Kennedy Space Center FL | (Swanson/DuBeau? magenta rubber-stamp) cachet (slightly different) on cover | IDCSP-20/27 launch |
| United States | 1968-06-13 | Kennedy Space Center FL | (R. DuBeau black rubber-stamp) cachet on cover | IDCSP-20/27 launch |
| United States | 1968-06-13 | Cape Canaveral FL | (Black and red typed) cachet on cover | IDCSP-20/27 launch ("secret messages and photographs") |
| IDCSP (on other than IDCSP launch covers) | ||||
| United States | 1969-02-09 | Cape Canaveral FL (machine cancel) | (Orbit Covers) cachet on TACOMSAT-1 launch cover | "Initial Defense Communications Satellite Program (ICSDP)" |
| United States | 1969-02-09 | Cape Canaveral FL (hand cancel) | (Orbit Covers) cachet on TACOMSAT-1 launch cover | |
| Defense Satellite Communications System (DSCS) (USAF) | ||||
| 1971-11-03: DSCS-2-1/2 | ||||
| United States | 1971-11-02 | Kennedy Space Center FL | (Space Voyage) cachet on cover, also insert | DSCS-2-1/2 launch |
| United States | 1971-11-02 | Satellite Beach FL | (Space Voyage) cachet on cover, also insert | DSCS-2-1/2 launch |
| United States | 1971-11-02 | Kennedy Space Center FL | (Green and brown rubber-stamp, based on a Sokalsky design) cachet on cover | DSCS-2-1/2 launch |
| United States | 1971-11-02 | Patrick AFB, FL | (Whitney magenta and blue and black) cachet on cover | DSCS-2-1/2 launch |
| United States | 1971-11-02 | Satellite Beach FL | (Whitney magenta and blue and black) cachet on (airmail) cover | DSCS-2-1/2 launch |
| United States | 1971-11-02 | Kennedy Space Center FL | (SpaceCraft/Swanson black rubber-stamp) cachet on cover | DSCS-2-1/2 launch ("spy satellite" and "Spook Bird") |
| United States | 1971-11-03 | Cape Canaveral FL | (Whitney magenta and blue and black) cachet on cover | DSCS-2-1/2 launch |
| United States | 1971-11-03 | Cape Canaveral FL | (Space Voyage) cachet on cover, also insert | DSCS-2-1/2 launch |
| United States | 1971-11-03 | Cape Canaveral FL (machine cancel) | (Riser/Andromeda/Cygnus Cover no.9) cachet on cover, also insert1 and insert2 | DSCS-2-1/2 launch |
| United States | 1971-11-03 | Cape Canaveral FL (machine cancel) | (Riser/Andromeda/Cygnus Cover no.9) cachet on (airmail) cover, also insert1 and insert2 | DSCS-2-1/2 launch |
| United States | 1971-11-03 | Cape Canaveral FL (hand cancel) | (Riser/Andromeda/Cygnus Cover no.9) cachet on (airmail) cover, also insert1 and insert2 | DSCS-2-1/2 launch |
| United States | 1971-11-03 | Kennedy Space Center FL | (Centennial) cachet on cover | DSCS-2-1/2 launch |
| United States | 1971-11-03 | Kennedy Space Center FL | (Centennial and black rubber-stamp) cachet on cover | DSCS-2-1/2 launch |
| United States | 1971-11-03 | Cape Canaveral FL | (Centennial blue) cachet on cover | DSCS-2-1/2 launch |
| United States | 1971-11-03 | Cape Canaveral FL | (Orbit Covers) cachet on cover | DSCS-2-1/2 launch |
| United States | 1971-11-03 | Cape Canaveral FL | (Grey printed) cachet on cover | DSCS-2-1/2 launch |
| United States | 1971-11-03 | Cape Canaveral FL | (Sarzin) cachet on cover | DSCS-2-1/2 launch |
| 1973-12-13: DSCS-2-3/4 | ||||
| United States | 1973-12-13 | Cape Canaveral FL | (Space Voyage) cachet on cover | DSCS-2-3/4 launch |
| United States | 1973-12-13 | Cape Canaveral FL | (Orbit Covers) cachet on cover | DSCS-2-3/4 launch |
| United States | 1973-12-13 | Patrick AFB, FL | (Whitney magenta and black) cachet on cover | DSCS-2-3/4 launch |
| United States | 1973-12-14 | Cape Canaveral FL | (Whitney magenta and black) cachet on cover | DSCS-2-3/4 launch |
| United States | 1973-12-14 | Cape Canaveral FL | (Centennial-like) cachet on cover | DSCS-2-3/4 launch |
| United States | 1973-12-14 | Cape Canaveral FL | (Centennial-like) cachet (different) on cover | DSCS-2-3/4 launch |
| 1975-05-20: DSCS-2-5/6 | ||||
| United States | 1975-05-20 | Kennedy Space Center FL | (SCPS ser.75/5 no.236) cachet on cover, also back | DSCS-2-5/6 launch ("project 777") |
| United States | 1975-05-20 | Kennedy Space Center FL | (SCPS ser.75/5 no.79) cachet (and signature) on cover, also back | DSCS-2-5/6 launch ("project 777") |
| United States | 1975-05-20 | Cape Canaveral FL | (Green printed) cachet on cover | DSCS-2-5/6 launch |
| United States | 1975-05-20 | Cape Canaveral FL | (Space Voyage) cachet on cover | DSCS-2-5/6 launch |
| United States | 1975-05-20 | Kennedy Space Center FL | (Space Voyage) cachet on cover | DSCS-2-5/6 launch |
| United States | 1975-05-20 | Cape Canaveral FL | (Centennial) cachet on cover | DSCS-2-5/6 launch |
| United States | 1975-05-20 | Kennedy Space Center FL | (Centennial) cachet on cover | DSCS-2-5/6 launch |
| United States | 1975-05-20 | Cape Canaveral FL | (Whitney blue and magenta) cachet on cover, also back | DSCS-2-5/6 launch |
| United States | 1975-05-20 | Patrick AFB, FL (machine cancel) | (Whitney blue and magenta) cachet on cover, also back | DSCS-2-5/6 launch |
| United States | 1975-05-20 | Patrick AFB, FL (hand cancel) Postal Service FL (machine cancel) | (Whitney blue and red) cachet on cover, also back | DSCS-2-5/6 launch |
| United States | 1975-05-20 | Kennedy Space Center FL | (Blue rubber-stamp) cachet on cover | DSCS-2-5/6 launch |
| 1977-05-12: DSCS-2-7/8 | ||||
| United States | 1977-05-12 | Cape Canaveral FL | (Orbit Covers) cachet on cover | DSCS-2-7/8 launch ("secret satellite") |
| United States | 1977-05-12 | Kennedy Space Center FL | (SCPS) cachet on cover | DSCS-2-7/8 launch ("program [project] 777") |
| United States | 1977-05-12 | Lompoc CA, Vandenberg AFB | (Vandy?/DuBeau? cyan rubber-stamp) cachet on cover | DSCS-2-7/8 launch (Westar-1/2/3 type or similar depicted) (project "777") |
| United States | 1977-05-12 | Cape Canaveral FL | (Centennial) cachet on cover | DSCS-2-7/8 launch |
| United States | 1977-05-12 | Kennedy Space Center FL | (Space Voyage) cachet on cover | DSCS-2-7/8 launch |
| United States | 1977-05-12 | Patrick AFB, FL | (Whitney purple and black) cachet on cover | DSCS-2-7/8 launch |
| United States | 1977-05-12 | Cape Canaveral FL | (Whitney purple and black) cachet on (airmail) cover | DSCS-2-7/8 launch |
| 1978-03-25: DSCS-2-9/10 [failed] | ||||
| United States | 1978-03-25 | Patrick AFB, FL | (Whitney purple and black) cachet on cover | DSCS-2-9/10 launch [failed] |
| United States | 1978-03-25 | Cape Canaveral FL | (Whitney purple and black) cachet on (airmail) cover | DSCS-2-9/10 launch [failed] |
| United States | 1978-03-25 | Cape Canaveral FL | (Centennial) cachet on cover | DSCS-2-9/10 launch [failed] |
| United States | 1978-03-27 | Kennedy Space Center FL | (Space Voyage) cachet on cover | DSCS-2-9/10 launch [failed] |
| 1978-12-13: DSCS-2-11/12 | ||||
| United States | 1978-12-13 | Kennedy Space Center FL | (SCPS) cachet on cover | DSCS-2-11/12 launch (project "triple 7" (777)) |
| United States | 1978-12-13 | Kennedy Space Center FL | (SCPS) cachet (and signature) on cover | DSCS-2-11/12 launch (project "triple 7" (777)) |
| United States | 1978-12-13 | Kennedy Space Center FL | (Space Voyage blue and green) cachet on cover | DSCS-2-11/12 launch |
| United States | 1978-12-13 | Kennedy Space Center FL | (Space Voyage blue and green and grey) cachet on cover | DSCS-2-11/12 launch |
| United States | 1978-12-13 | Cape Canaveral FL | (Space Voyage blue and green and grey) cachet on cover | DSCS-2-11/12 launch |
| 1979-11-21: DSCS-2-13/14 | ||||
| United States | 1979-11-20 | Kennedy Space Center FL | (Space Voyage) cachet on cover | DSCS-2-13/14 launch |
| United States | 1979-11-20 | Kennedy Space Center FL | (SCPS ser.79/18) cachet (and signature) on cover, also back | DSCS-2-13/14 launch |
| United States | 1979-11-20 | Cape Canaveral FL (hand cancel) | (Whitney orange and black) cachet on cover | DSCS-2-13/14 launch |
| United States | 1979-11-20 | Cape Canaveral FL (machine cancel) | (Whitney orange and black) cachet on (airmail) cover | DSCS-2-13/14 launch |
| 1982-10-30: DSCS-2-16 and DSCS-3-A1 | ||||
| United States | 1982-11-01 | Kennedy Space Center FL | (Space Voyage) cachet on cover | DSCS-2-16 and DSCS-3-A1 launch |
| DSCS-3-B4/B5 (pre-launch events) | ||||
| United States | 1985-08-30 | Cape Canaveral FL | (Centennial) cachet on cover | STS-51J pre-launch: "rollout" ("secret military mission") |
| United States | 1985-09-12 | Kennedy Space Center FL | (Centennial red and black) cachet on cover | STS-51J pre-launch: "flight readiness test" ("secret military mission") |
| United States | 1985-09-12 | Kennedy Space Center FL | (Centennial brown and black) cachet on cover | STS-51J pre-launch: "flight readiness test" ("secret military mission") |
| 1985-10-03: DSCS-3-B4/B5 (deployed by STS-28 (51J)) | ||||
| United States | 1985-10-03 | Kennedy Space Center FL | (RSDSC) cachet on cover, also insert and insert back | STS-51J launch |
| United States | 1985-10-03 | Kennedy Space Center FL | (Zaso silk/IASP no.113) cachet on cover | STS-51J launch |
| United States | 1985-10-03 | Kennedy Space Center FL | (Zaso silk/IASP no.114) cachet on cover | STS-51J launch ("secret satellites" and "secret cargo") |
| United States | 1985-10-03 | Kennedy Space Center FL | (Zaso silk/IASP no.115) cachet on cover | STS-51J launch ("secret" and "secret satellite") |
| United States | 1985-10-03 | Cape Canaveral FL | (Whitney magenta and blue) cachet (and signatures) on cover | STS-51J launch |
| United States | 1985-10-03 | Kennedy Space Center FL | (Colorano silk) cachet on cover | STS-51J launch ("secrecy") |
| United States | 1985-10-03 1986-07-04 | Houston TX Liberty Island NY/NJ | (Space Voyage/First Rank) cachet on cover | STS-51J launch USA 2224 FDC |
| United States | 1985-10-04 | Cape Canaveral FL | (Colorano silk) cachet on cover | DSCS-3-B4/B5 deployed |
| United States | 1985-10-07 | Edwards AFB. CA | (Zaso silk/IASP no.116) cachet on cover | STS-51J landing |
| United States | 1985-10-07 1986-07-04 | Houston TX Liberty Island NY/NJ | (Space Voyage/First Rank) cachet on cover | STS-51J landing USA 2224 FDC |
| 1989-09-05: DSCS-2-15 and DSCS-3-A2 | ||||
| United States | 1989-09-05 | Lompoc CA, Vandenberg AFB | (Boudwin magenta and grey rubber-stamp, based on a Swanson design, and black rubber-stamp text) cachet on (airmail) cover | DSCS-2-15 and DSCS-3-A2 launch ("top secret" and "nicknamed White cloud"); ("cluster of four satellites" is unclear!) |
| 1992-02-11: DSCS-3-B14 | ||||
| United States | 1992-02-10 | Cape Canaveral FL | (Carsten Fuchs/Ken Havekotte) cachet on cover | DSCS-3-B14 launch |
| DSCS (on other than DSCS launch covers) | ||||
| United States | 1971-03-20 | Lompoc CA, Vandenberg AFB | (Space Voyage) insert from Jumpseat-1 launch cover, also front | "DSCS (Defense Satellite Communications System)" |
| United States | 1971-03-20 | Lompoc CA, Vandenberg AFB | (InterSpace Cover) insert from Jumpseat-1 launch cover, also front | |
| United States | 1975-06-21 | Cape Canaveral FL | (Blue and red rubber-stamp) cachet on OSO-8 launch cover | DSCS-2 |
| United States | 1975-08-20 | Kennedy Space Center FL | (Blue and red rubber-stamp) cachet on Viking-1 launch cover | DSCS-2 |
| United States | 1975-09-25 | Kennedy Space Center FL | (Blue and red rubber-stamp) cachet on Intelsat-4A-1 launch cover | DSCS-2 |
| United States | 1975-10-16 | Kennedy Space Center FL | (Blue and red rubber-stamp) cachet on GOES-1 launch cover | DSCS-2 |
| United States | 1975-12-12 | Kennedy Space Center FL | (Blue and red rubber-stamp) cachet on Satcom-1 launch cover | DSCS-2 |
| United States | 1975-12-15 | Kennedy Space Center FL | (Blue and red rubber-stamp) cachet on DSP-5 launch cover | DSCS-2 |
| United States | 1976-01-15 | Kennedy Space Center FL | (Blue and red rubber-stamp) cachet on Helios-2 launch cover | DSCS-2 |
| United States | 1976-01-19 | Kennedy Space Center FL | (Blue and red rubber-stamp) cachet on CTS launch cover | DSCS-2 |
| United States | 1976-02-19 | Kennedy Space Center FL | (Blue and red rubber-stamp) cachet on Marisat-1 launch cover | DSCS-2 |
| United States | 1976-04-22 | Kennedy Space Center FL | (Space Voyage) cachet on NATO-3A launch cover | "interoperable with US Defense Satellite communications" (DSCS) |
| United States | 1976-04-22 | Cape Canaveral FL | (Space Voyage) cachet on NATO-3A launch cover | |
1Explorer-6 and Pioneer-5 were similar "paddlewheel" satellites. It is believed that Explorer-6 contained two short antennas on its "top", whereas Pioneer-5 contained only a single short antenna. When there are no antennas on top, the distinction is unclear, but of the two, Pioneer-5 is assumed.
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