U.S. Air Force Tech. Sgt. Christopher Dominguez assigned to the 129th Rescue Wing Maintenance Squadron conducts an HH-60G Pave Hawk rescue helicopter engine run, Moffett Federal Airfield, Calif., Nov. 26, 2013. Engine troops and maintainers have many responsibilities and can be tasked to maintain multiple aircrafts and engines types. They know and implement a great deal of knowledge on a daily basis. (U.S. Air Force photo by Senior Airman John D. Pharr III /Released)