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USA 75

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USA 75 is classified as:


NORAD ID: 21805
Int'l Code: 1991-080B
Perigee: 36,079.5 km
Apogee: 36,123.3 km
Inclination: 14.2 °
Period: 1,451.8 minutes
Semi major axis: 42472 km
RCS: Unknown
Launch date: November 24, 1991
Source: United States (US)
Launch site: AIR FORCE EASTERN TEST RANGE (AFETR)

Infrared sensors to detect heat from missile and booster plumes against earth's background; detection capability of smaller missiles; improved warning of attack by short-range missiles against U.S. and allied forces.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 21805U 91080B   25199.53117808  .00000055  00000-0  00000-0 0  9993
2 21805  14.1839 347.8829 0005161 117.5001 253.5324  0.99184321 22402
Source of the keplerian elements: McCants