LES-8, LES-9, Solrad-11a, Solrad-11b

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.

SOLRAD (short for "SOLar RADiation") was an American series of satellites sponsored by the US Navy in a program to continuously monitor the Sun. SOLRAD was the Naval Research Laboratory's first post-Vanguard satellite.