U.S. Air Force Tech. Sgt. Christopher Dominguez assigned to the 129th Rescue Wing Maintenance Squadron conducts engine and propulsion inspections on an MC-130P Combat Shadow refueling aircraft, 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)