U.S. soldiers with Bravo Battery, 1st Battalion, 41st Field Artillery Regiment, 1st Brigade Combat Team, 3rd Infantry Division, bow their heads as Maj. Daniel Finkhousen, the brigade's chaplain, offers an invocation on Christmas Day at Forward Operating Base Al Masaak in Afghanistan's Zabul province on Tuesday, Dec. 25, 2012. (U.S. Army/1st Lt. Vanessa Macekura)

U.S. soldiers with Bravo Battery, 1st Battalion, 41st Field Artillery Regiment, 1st Brigade Combat Team, 3rd Infantry Division, bow their heads as Maj. Daniel Finkhousen, the brigade's chaplain, offers an invocation on Christmas Day at Forward Operating Base Al Masaak in Afghanistan's Zabul province on Tuesday, Dec. 25, 2012. (U.S. Army/1st Lt. Vanessa Macekura)