A U.S. Air Force security forces Airman secures the outside of a hardened facility after neutralizing the opposing force during a combat training course on Ramstein Air Base, Germany, May 30, 2015. Battlefield Leaders Assaulter Course, Integrated Combat Essentials -- or BLAC ICE is designed to teach security forces members from multiple countries advanced tactics and shooting skills for use in the event of a base security breach. (U.S. Air Force photo/ Tech. Sgt. Ryan Crane)
U.S. and European security forces discuss their strategy prior to breaching a hardened facility during a combat training course on Ramstein Air Base, Germany, May 30, 2015. Battlefield Leaders Assaulter Course, Integrated Combat Essentials -- or BLAC ICE is designed to teach security forces members from multiple countries advanced tactics and shooting skills for use in the event of a base security breach. (U.S. Air Force photo/ Tech. Sgt. Ryan Crane)
Two Spanish Navy Harriers fly behind a U.S. Marine KC-130J aircraft from Special-Purpose Marine Air-Ground Task Force Crisis Response-Africa during an aerial-refueling exercise off the coast of Spain May 15, 2015. The aerial-refueling capabilities of the KC-130J greatly extend the range and flight times of NATO aircraft. (U.S. Marine Corps photo by Sgt. Paul Peterson/Released)