Spc. Philip Buettner with C Company, 5th Battalion, 159th General Support Aviation Brigade, from Cheyenne, Wyo., checks the oil for the auxiliary power unit on a UH-60 Black Hawk helicopter at the National Training Center (NTC), Fort Irwin, Calif., Aug. 20. The unit is attached to 1st Battalion, 183rd Aviation Task Force, to support the 116th Cavalry Brigade Combat Team during force-on-force battle simulation training. (Photo by Maj. W. Chris Clyne, 115th Mobile Public Affairs Detachment)

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