Launched 4 October1960, Courier1B was the world’s first active repeater satellite.
Courier was built by the Palo Alto, California–based Western Development Labs (WDL) division of Philco, previously known as Army Fort Monmouth Laboratories and now the Space Systems/Loral division of Loral Space and Communications.
Proposed by the U.S. Army Signal Corps in September 1958, this satellite was a flown in 1960.