The Hermes Program was a post WW-II American program which utilized German missile designs. Best known of this series was the Hermes A2, which was the A-4 (V-2) copy. The Hermes A1 was based on the Wasserfall, a surface to air missile developed at Peenemunde in 1942, but which never reached production. General Electric developed an built the Hermes A1, which was about ¼ the size of the Hermes A2.
The other big difference between the A1 and A2 was that the A1 had 4 extra fins on the sides of the rocket body. This was to allow greater maneuverability when the rocket was being guided to a target aircraft. The guidance was done visually during daylight and with radar assist at night. Steering from the ground was done with a joystick.
Five A1s were successfully tested at White Sands Range in New Mexico in 1950 and 51. The entire Hermes program was canceled in 1954.