OPERATION ENDURING FREEDOM -- Airman 1st Class Nathan Jacobson performs liquid oxygen service to a B-52 Stratofortress at a forward-deployed location May 16 in preparation for a sortie supporting operations Iraqi Freedom and Enduring Freedom. He is a crew chief assigned to the 40th Expeditionary Maintenance Squadron. (U.S. Air Force photo by Staff Sgt. Jocelyn Rich)