"Jupiter AM-7 flew 2,235 km (1,207 nautical miles) on August 27, 1958 from LC 26A. The inertial guidance flight carried the first solid propellant vernier and spin motors on its aft unit and the first live fusing system for its inert warhead. Prior flights had used a liquid hydrogen peroxide monopropellant vernier."
Above per:
www.spacelaunchreport.com/jupiter4.html