Airmen assigned to the 821st Contingency Response Squadron, build a defense fighting position as a C-130 Hercules aircraft prepares to land during Exercise Turbo Distribution 16-02, March 15, 2016, at Amedee Army Airfield, Calif. Defense fighting positions allow cover and concealment from the enemy and in conjunction with others allows 360 degrees field of fire around the base. (U.S. Air Force photo by Staff Sgt. Robert Hicks/Released)