Senior Master Sgt. John Gallo, 517th Airlift Squadron, checks his location before dropping cargo over the drop zone near Katchemak bay, Alaska, Feb. 10, 2010. Gallo was participating in an exercise that involved Pacific Air Force and Air Mobility Command C-17s exploring capabilities in large formations and improving tactical awareness among aircrews. (U.S. Air Force photo/Senior Airman Matt Coleman-Foster)