The 29 July 1949 update of the Staff Target called for a maximum range of and a minimum of . Maximum altitude should be 55,000 ft, but 45,000 would be considered acceptable. A later updated pushed the range to against a , later , target. It was assumed the targets would "jink" at 1G, so the missile needed to maneuver at 4G at sea level and 2.5G at 40,000 ft. Additional requirements were the ability to switch between targets in 6 seconds.