They're checking the list and checking it twice
Staff Sgt. Mitchell Newman and Senior Airman Daniel Bohn, 2nd Logistics Readiness Squadron Fuels Facilities, look over checklists before refilling liquid oxygen carts on Barksdale Air Force Base, La., April 4, 2013. The liquid oxygen carts are used by crew chiefs to supply a B-52H Stratofortress crew with a source of breathable air during flight. (U.S. Air Force photo/Airman 1st Class Andrew Moua)
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