Us-a

US-A

Upravlyaemy Sputnik Aktivnyj (Russian: Управляемый Спутник Активный), or US-A, also known in the west as Radar Ocean Reconnaissance Satellite or RORSAT, was a series of Soviet reconnaissance satellites. Launched between 1967 and 1988 to monitor NATO and merchant vessels using active radar, the satellites were powered by nuclear reactors.