U.S. Marines and Canadian soldiers participate in insertion-and-extraction training with a Canadian air force CH-147F Chinook helicopter conducting a pinnacle landing during Rim of the Pacific 2016 at Camp Pendleton, California, July 15, 2016. Canadian forces photo by Sgt Marc-André Gaudreault The Experimental Aircraft Association’s B-17G “Aluminum Overcast,” banks right above Hill Air Force Base, Utah, Aug. 13, 2015. EAA’s B-17 is painted to resemble B-17G No. 42-102515 of the 398th Bombardment Group (Heavy) that flew from Royal Air Force Nuthampstead, England, during World War II. U.S. Air Force photo by R. Nial Bradshaw A special missions aviator from the 41st Rescue Squadron looks out from an HH-60G Pave Hawk over Grand Bay Bombing and Gunnery Range at Moody Air Force Base, Georgia, May 20, 2016. U.S. Air Force photo by Airman Daniel Snider Coast Guard Cutter Stratton's crewmembers aboard a small boat return to the Stratton after a humanitarian assistance/disaster relief event for Rim of Pacific (RIMPAC) 2016, the world's largest international maritime exercise, in the Pacific Ocean, Hawaii, July 13, 2016. Coast Guard photo by Petty Officer 3rd Class Loumania Stewart An MH-53E Sea Dragon of HM-14 flies above the Pacific Ocean, July 11, 2016, during Rim of the Pacific (RIMPAC) 2016, the world's largest international maritime exercise. Navy photo by Petty Officer 2nd Class Stacy M. Atkins Ricks An Army Reserve soldier fires an M240B machine gun mounted on a Humvee during a night-fire qualification at Fort Hunter Liggett, California, May 3, 2016. Army photo by Master Sgt. Michel Sauret An A-10 Thunderbolt II from the 127th Wing, Michigan Air National Guard, lands on a remote highway strip near Jägala, Estonia after completing a simulated close air support mission in a combined arms live fire exercise during Saber Strike on June 20, 2016. Minnesota National Guard photo by Tech. Sgt. Amy M. Lovgren MH-60S Sea Hawk helicopters assigned to the Indians of Helicopter Combat Squadron (HSC) 6 fly in formation while embarked aboard the aircraft carrier USS Ronald Reagan (CVN 76). U.S. Navy photo by Mass Communication Specialist 3rd Class Paul Archer The Spanish navy frigate Alavaro de Bazan (F101) fires chaff rockets during NATO Exercise Dynamic Guard 15. NATO HQ MARCOM photo A U.S. Air Force B-52 Stratofortress leads a formation of aircraft including two Polish Air Force F-16s, four U.S. Air Force F-16 Fighting Falcons, two German Eurofighter Typhoons, and four Swedish Gripens over the Baltic Sea, June 9, 2016 during Exercise BALTOPS 2016. U.S. Air Force photo by Senior Airman Erin Babis