Senior Airman Leo Avila, 709th Airlift Squadron C-5M Super Galaxy engineer, 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 marshy terrain during the exercise. (U.S. Air Force photo/Airman 1st Class William Johnson)

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