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The U.S. Navy began replacing and upgrading its ultra-high frequency (UHF) satellite communications network during the 1990s with a constellation of customized satellites built by Hughes Space and Communications Company. Known as the UFO (Ultra High Frequency Follow On) series, these HS-601 model satellites support the Navy's global communications network, serving ships at sea and a variety of other U.S. military fixed and mobile terminals.
Height 43.90 Meters
Max Stages 2
Mass To GTO 0 kg
Liftoff Thrust 1939 kN
Diameter 3.05 Meters
Mass To LEO 5900 kg
Liftoff Mass 164 Tonnes
Launch Success 9
Consecutive Success 7
Maiden Flight 1990-07-25
Launch Failures 2