Rocket number Time Launch site Pad Maximum altitude Remarks Image 1948 Bumper 1 May 13, 1948 White Sands Pad 33 127.3 km (79.1 mi) Test flight; WAC 2nd stage partially fueled. Bumper 2 August 19, 1948 White Sands Pad 33 13.4 km (8.3 mi) First stage failed due to propellant flow interruption. Bumper 3 September 30, 1948 White Sands Pad 33 150.3 km (93.4 mi) WAC stage failed.