LES 3 & 4, OV2-3, OSCAR-4

OSCAR IV (a.k.a. OSCAR 4) is the fourth amateur radio satellite launched by Project OSCAR and the first targeted for Geostationary orbit.

Orbiting Vehicle or OV, originally designated SATAR, was a series of American satellites operated by the US Air Force.

The Lincoln Experimental Satellite series was designed and built by Lincoln Laboratory at MIT between 1965 and 1976, under USAF sponsorship, for testing devices and techniques for satellite communication.