Orbiting Vehicle or OV, originally designated SATAR, was a series of American satellites operated by the US Air Force, launched between 1965 and 1971. Forty seven satellites were built, of which forty three were launched and thirty seven reached orbit. With the exception of the OV3 series, and OV4-3, they were launched as secondary payloads, using excess space on other missions. Typically, OV satellites carried scientific or technological experiments.