U.S. Army Chief Warrant Officer Derrick Griblin, assigned to 4th Platoon, Charlie Company, 2-149th General Support Aviation Brigade, Task Force No Mercy, checks the rotor blades during conduct preflight checks and maintenance on a UH-60 Black Hawk on Forward Operating Base Salerno, Khowst province, Afghanistan, Dec. 4, 2012. The preparation is essential for the team to be able to take off as fast as possible if they were to receive a call for a medical evacuation. (U.S. Army photo by Sgt. Kimberly Trumbull/Released)
Sgt. Kimberly Trumbull
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