MILSTAR

MILSTAR(military, strategic, and tactical relay satellite) are a family of U.S. satellite communications systems that are optimized to be survivable in the face of nuclear warfare and jamming; they are of the "protected" rather than "wideband" class. MILSTAR I and II are operational, but they will gradually be replaced by the Advanced Extremely High Frequency (AEHF) family, which at one time was designated MILSTAR III.

MILSTAR satellites were the first to use Extremely High Frequency (EHF) communications.