TACOMSAT (also known as TACSAT 1, OPS 0757, or Tactical Communications Satellite) was a communications satellite designed and built by Hughes Aircraft Corporation under the direction of the United States Air Force Space and Missile Systems Organization (SAMSO).

[1] At 7.62 meters (25.0 ft) in length and 2.81 feet (0.86 m) in diameter, TACOMSAT was the largest and most powerful communications satellite at the time of its launch.

The 3.4 meters (11 ft)-long main cylinder of the HS-308 bus was spin-stabilized at 54 rpm with the antennas mounted to a despun platform in an early version of the Hughes Gyrostat design.

The two transponders could be interconnected, allowing all signals to be exchanged between bands with a reduced usable bandwidth of 425 kHz.

After more than three years of successful experiments by the US Army, US Air Force, and US Navy, TACSAT was decommissioned on December 16, 1972.