A U.S. Marine Critical Skills Operator with 1st Marine Special Operations Battalion, Marine Corps Forces, Special Operations Command prepares to execute his final jump of a double-bag static line (DBSL) parachute training course, Aug 29, 2014, conducted in rural Arizona. The DBSL course was an introduction to the High Altitude, High Opening (HAHO) insertion method utilized by Special Operations Forces. (U.S. Marine Corps Photo by Lance Cpl. Steven M. Fox/Released)