A U.S. Air Force and Polish Jumpmaster issue the command of "hook up" static lines during airborne operations at International Jump Week (IJW), Ramstein Air Base, Germany, July 8, 2015. The 435th Contingency Response Group hosts IJW annually, to build global partnerships, foster camaraderie between U.S. and international paratroopers, and to exchange current tactics, techniques and procedures pertaining to Airborne Operations (Static Line and Military Free Fall). (U.S. Army Photo By Staff Sgt. Justin P. Morelli / Released)