SSgt. Mitchell Newman and SrA. Daniel Bohn, members of the 2nd Logistics Readiness Squadron's fuels facilities section, push a cart filled with liquid oxygen for a B-52H Stratofortress at Barksdale AFB, La., April 4, 2013. A B-52 can hold up to 75 gallons of LOX, which supplies the aircrew with breathable air at high altitudes, according to squadron officials. ()