An MV-22 Osprey lands during a personnel recovery training exercise in Southwest Asia, July 28, 2015. The 185th Theater Aviation Brigade conducts interoperability training missions to enhance mission capabilities between U.S. Army aviation and other U.S. military forces. (U.S. Army National Guard photo by Army Sgt. Michael Needham/Released)

Two U.S. Air Force F-16 Fighting Falcons, from the New Jersey Air National Guard’s 177th Fighter Wing, left, lead a mixed formation including a Bulgarian air force MiG-29 Fulcrum and MiG-21 Fishbed over Bulgaria during Thracian Star on July 20, 2015. Thracian Star 2015 is a bilateral training exercise to enhance interoperability with the Bulgarian air force, hosted by Graf Ignatievo Air Base. (U.S. Air National Guard photo by Master Sgt. Andrew J. Moseley/Released)

150729-N-MJ645-193 PACIFIC OCEAN (July 29, 2015) — Electrician’s Mate Fireman Christopher Appel, a native of Barberton, Ohio, exercises in the hangar bay aboard USS John C. Stennis (CVN 74). The Sailors from the John C. Stennis Strike Group are undergoing the Composite Training Unit Exercise (COMPTUEX), the final step before being certified for deployment. (U.S. Navy photo by Mass Communication Specialist 2nd Class Marcus L. Stanley/Released)

U.S. paratroopers with C Battery, 4th Battalion, 319th Airborne Field Artillery Regiment, 173rd Airborne Brigade, load a M119A2 howitzer in support of the British army’s 1st Battalion, Royal Irish Regiment during exercise Wessex Storm at the 7th Army Joint Multinational Training Command’s Grafenwoehr Training Area, Germany, July 28, 2015. (U.S. Army photo by Visual Information Specialist Gertrud Zach/released)