U.S. Staff Sgt. Suzzett Stalesky, 9th Physiological Support Squadron launch and recovery technician, demonstrates the use of tube food by inserting it into the feeding port of a U-2 full pressure suit helmet at Beale Air Force Base, Calif., Feb. 5, 2013. The U-2 is the only aircraft in the Department of Defense inventory that requires the utilization of a full pressure suit. (U.S. Air Force photo by Airman 1st Class Drew Buchanan/Released)