The Grumman F6F-3 Hellcat used to monitor radio activity at Bikini after the Test Baker blast is located at the Smithsonian's National Air and Space Museum's Udvar-Hazy Center.
The plane was launched unmanned soon after the bomb was detonated on July 25, 1946. Instruments on board and photographic plates taped to the control stick obtained data on radioactivity. Unmanned drones -- which at the time were a huge feat for the military -- played numerous roles in these early nuclear tests.
It was the first operation in which takeoff, flight, and landing were accomplished with no one aboard. Drones are common in today's advanced military, but in 1946, the feat was an impressive one: many experts had thought it could never be accomplished with planes of this size.