Soldiers from the 1st Battalion, 508th Parachute Infantry Regiment, conduct a static-line airdrop from an Air Force C-17 Globemaster III aircraft during Joint Operational Access Exercise 13-02 at Sicily drop zone, Fort Bragg, N.C., Feb. 24, 2013. The JOAX exercises are a combined exercises that enables U.S. and Canadian mobility aircrews to train with paratroopers from the Army's 82nd Airborne Division on projecting combat power in a denied environment -- one of the future-war challenges areas that spurred the department to launch the recent Operational Challenges Crowdsourcing Initiative. Air Force photo by Tech. Sgt. Jason Robertson