A Titan IIIC, launched from Cape Canaveral, placed into synchronous orbits the first pair of 1,200-pound advanced communications satellites of the Defense Satellite Communication System Phase II (DSCS II). After some initial difficulties with the satellites, telemetry and command links were established with both satellites by 5 November. Under SAMSO program management, TRW Systems Group manufactured these second generation communications satellites that were intended as replacements for the 26-satellite Initial Defense Satellite Communication Systems (IDSCS). Each of the DSCS II (Program 777) satellites would be able to handle voice, teletype, computerized digital data, and video transmissions. Defense Satellite Communications System. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A). Positioned in geosynchronous orbit over the Americas at 106 deg W in 1972-?; over the Americas at 81 deg W in 1977-1979; over the Americas at 100-110 deg W in drift 1979-1998 As of 1 September 2001 located at 103.05 deg W drifting at 0.044 deg W per day. As of 2007 Mar 9 located at 110.10W drifting at 0.035W degrees per day.

Defense Satellite Communications System. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A). Positioned in geosynchronous orbit over the Americas at 112 deg W in 1972. As of 30 August 2001 located at 146.34 deg E drifting at 0.101 deg W per day. As of 2007 Mar 5 located at 36.33W drifting at 0.201E degrees per day.

An Air Force Titan IIIC, launched by the 6555th Aerospace Test Group from the Eastern Test Range, boosted two Program 777 Defense Satellite Communications Systems; 13 deg W. A new inertial guidance system, manufactured by Delco Electronics for the Titan IIIC made its first flight. The new system consisted of an inertial measurement unit and a missile guidance computer. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit over the Atlantic Ocean at 13 deg W in 1974-1977; over the Atlantic Ocean 57-66 deg W in 1977-1979 As of 3 September 2001 located at 104.01 deg E drifting at 9.429 deg W per day. As of 2007 Mar 9 located at 148.24W drifting at 9.427W degrees per day.

Defense Satellite Communications System; 175 deg E. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit over the Pacific Ocean at 175 deg E in 1974-1977; over the Indian Ocean 65 deg E in 1977-1980; over the Indian Ocean 60-61 deg E in 1980-1984; over the Indian Ocean 66 deg E in 1984-1987; over the Americas at 56-62 deg W in 1989-1993 As of 5 September 2001 located at 138.02 deg W drifting at 9.919 deg W per day. As of 2007 Mar 3 located at 146.85E drifting at 9.914W degrees per day.

The third pair of Defense Satellite Communications System II satellites was launched; the launch failed due to a malfunction in the Transtage of the Titan IIIC launch vehicle. Unusable orbit. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

The third pair of Defense Satellite Communications System II satellites was launched; the launch failed due to a malfunction in the Transtage of the Titan IIIC launch vehicle. Unusable orbit. Space craft engaged in investigation of spaceflight techniques and technology (US Cat A).

A Titan IIIC launched a pair of DSCS II satellites into orbit from Cape Canaveral, Florida. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit over the Atlantic Ocean at 12 deg W in 1977-1979; over the Atlantic Ocean 5 deg W in 1979; over the Pacific Ocean 140 deg E in 1980-1981 As of 28 August 2001 located at 152.07 deg W drifting at 12.959 deg W per day. As of 2007 Mar 10 located at 47.37W drifting at 12.959W degrees per day.

A Titan IIIC launched a pair of DSCS II satellites into orbit from Cape Canaveral, Florida. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit over the Pacific Ocean at 175 deg E in 1977-1979 over the Atlantic Ocean 12 deg W in 1979-80 over the Pacific Ocean 175 deg E in 1980-1983 over the Pacific Ocean180 deg E in 1983-1986 over the Atlantic Ocean 1 deg W in 1986-1989 As of 3 September 2001 located at 143.55 deg W drifting at 17.451 deg W per day. As of 2007 Mar 9 located at 13.13E drifting at 17.445W degrees per day.

A Titan IIIC was launched from Cape Canaveral carrying DSCS II satellites F-9 and F-10. The vehicle suffered a failure in its second stage hydraulic system about eight minutes after liftoff, and both the vehicle and its payload were lost. Launched with DSCS F10.

A Titan IIIC was launched from Cape Canaveral carrying DSCS II satellites F-ll and F-12. The vehicle placed the satellites in the proper orbit, and the satellites performed normally once there. They were expected to go into operation in mid-January 1979, at which point the DSCS II system would have a full, four-satellite constellation at its disposal for the first time in its history. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit over the Pacific Ocean at 135 deg W in 1979-1983 over the Pacific Ocean 129 deg W in 1983-1989 As of 5 September 2001 located at 62.62 deg W drifting at 22.467 deg W per day. As of 2007 Mar 10 located at 96.59E drifting at 22.469W degrees per day.

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit over the Pacific Ocean at 175 deg E in 1979-1981 over the Indian Ocean 66 deg E in 1981-1983 over the Indian Ocean 60 deg E in 1983-1987 over the Pacific Ocean177 deg E in 1988-1989 over the Indian Ocean 71 deg E in 1990-1992 As of 1 September 2001 located at 93.28 deg E drifting at 6.600 deg W per day. As of 2007 Mar 8 located at 143.60E drifting at 6.589W degrees per day.

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit at 12 deg W in 1980-1981; 131 deg W in 1981-1983; 179 deg W in 1983; 175 deg E in 1983-1989;179 deg W in 1989-1993 As of 3 September 2001 located at 21.08 deg E drifting at 16.828 deg W per day. As of 2007 Mar 10 located at 37.50W drifting at 16.828W degrees per day.

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit at 66 deg E in 1980-1981; 12 deg W in 1981-1986; 179 deg W in 1986-1990; 174 deg E in 1990; 65 deg E in 1991-1994 As of 31 August 2001 located at 27.01 deg W drifting at 6.916 deg W per day. As of 2007 Mar 11 located at 50.79E drifting at 6.926W degrees per day.

Positioned in geosynchronous orbit at 15 deg W in 1983-1987; 66 deg E in 1987; 60 deg E in 1987-1994; 65 deg E in 1994-1997 As of 5 September 2001 located at 114.00 deg W drifting at 18.661 deg W per day. As of 2007 Mar 9 located at 172.94E drifting at 18.658W degrees per day. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Released from STS 51J 4 October 1985; boosted into orbit with DSCS 3 F3 on single IUS booster. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Positioned in geosynchronous orbit; at 180 deg E in 1994.

Launch vehicle put payload into geosynchronous transfer orbit with GCS trajectory option. Positioned in geosynchronous orbit at 12 deg W in 1995-1996. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C). Launch vehicle put payload into geosynchronous transfer orbit with GCS trajectory option. Positioned in geosynchronous orbit at 175 deg E in 1995-1997.

Launch vehicle put payload into geosynchronous transfer orbit with GCS trajectory option. Positioned in geosynchronous orbit at 52 deg W in 1995; 60 deg E in 1997. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).

Military Communications satellite. Launch delayed from October 12 by spacecraft problem. The US Air Force Defense Satellite Communications System satellite was placed by the Centaur upper stage into a 148 km x 898 km x 29.3 deg parking orbit. A second burn put it into a 218 km x 35,232 km x 26.0 deg transfer orbit. The DSCS III B-11 IABS-8 apogee stage, with two Primex R4D liquid apogee engines, circularised the orbit at geostationary altitude on October 21 and then separated from the DSCS.