Senior Airman Leo Avila, a C-5M Super Galaxy engineer assigned to the 709th Airlift Squadron, uses coordinates to mark his crew’s position on a map during a combat survival training exercise July 16, 2015, at the Blackbird State Forest near Smyrna, Del. The crew was equipped with a compass and a map to navigate several miles of woodland and marsh terrain during the exercise. (U.S. Air Force photo/Airman 1st Class William Johnson)