A 52nd Component Maintenance Squadron aerospace propulsion journeyman works on a jet engine component during a graveyard shift on Spangdahlem Air Base, Germany, August 5, 2015. Jet engine components are brought into the shop for scheduled maintenance that is required after an engine has gone through 4,000 cycles. The graveyard shift, also referred to as a swing shift, is a period of time when <PERSON> work from nighttime through early morning hours. (U.S. Air Force photo by <PERSON>/Released)