Col. Robert Lepper relinquished command of the 412th Maintenance Group at Edwards Air Force Base, Calif., to Col. Stephen Grotjohn July 13.
Brig. Gen. Carl Schaefer, 412th Test Wing commander, presided over the change of command ceremony held in Hangar 1600, home to the 412th MXG.
Grotjohn returns to Edwards following an assignment as Maintenance Division chief, Directorate of Logistics, Headquarters, Air Force Special Operations Command at Hurlburt Field, Fla. He has served in multiple maintenance leadership positions and previously commanded the 412th Aircraft Maintenance Squadron here.
As 412th MXG commander, he will oversee the most diverse maintenance group in the Air Force with 1,700 personnel and more than 80 highly-modified test and support aircraft. The group conducts logistics test and evaluation on aircraft, aircraft subsystems, support equipment and technical orders for program offices, combined test forces, NASA, U.S. Air Force Test Pilot School and commercial contractors. The 412th MXG also provides flightline and back shop maintenance support for the Air Force, DOD and contractor planes undergoing test and evaluation.