In this Friday, February 2, 2018, photograph, two Yemeni soldiers allied to the country's internationally recognized government walk near the wreckage of destroyed military vehicles on the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (Photo by Jon Gambrell/AP Photo)





The USAF pilot shots an amazing selfie flying of his U-2 Dragon Lady plane. The scenes unfolded while he was flying over Canada in late February 2018, though, given his profession, the pilot couldn’t provide too specific locations or dates. The spy plane was travelling at around 500 mph at an altitude of around 70,000 feet (21,3 Km). (Photo by Extreme Ross Photography/Caters News Agency)





U.S. Marine Corps Lance Cpl. Skyler Stevens uses new night optics technology at Marine Corps Base Camp Pendleton, USA on March 26, 2018. (Photo by Lance Cpl. Rhita Daniel/Reuters/U.S. Marine Corps)





A Turkish-backed Syrian rebel drives past a burning shop in the city of Afrin in northern Syria on March 18, 2018. Turkish forces and their rebel allies were in control of the Kurdish-majority city of Afrin in northwestern Syria, AFP journalists on the ground reported. (Photo by Bulent Kilic/AFP Photo)





A C-130 Hercules aircraft prepares to land at Bagram airbase ib Kabul, Afghanistan on March 21, 2018. Gen Joe Dunford, chairman of the Joint Chiefs of Staff, visited Kandahar province for talks with regional authorities. (Photo by Navy Petty Officer 1st Class Dominique A. Pineiro/DoD via Reuters)





The first all-female RAF Tornado jet crew to fight in Afghanistan, 2009. (Photo by Cpl Steve Bain/RAF/ABIPP/PA Wire)





Militants of The Movement for the Salvation of Azawad listen to instructions at a waypoint while patrolling along the Mali-Niger border in the deserted area in the Meneka region in Mali during an anti jihadist patrol on February 5, 2018. (Photo by Souleymane Ag Anara/AFP Photo)





U.S. Marine Corps Lance Corporal Briar Purty tests Drone Killer Counter-UAS Technology at Marine Corps Base Camp Pendleton, USA on March 28, 2018. (Photo by Lance Cpl. Rhita Daniel/Reuters/U.S. Marine Corps)





Canadian Forces door gunner Sergeant Chad Zopf leans out of a CH-146 Griffon helicopter during a training exercise in Kandahar district, Afghanistan June 18, 2011 in this handout photo obtained by Reuters March 19, 2018. (Photo by Sgt Matthew McGregor/Reuters/Canada Department of National Defence)





U.S. Marine Corps Lance Corporal Jose Nieves tests a Step In Visor and Low Profile Mandible at Marine Corps Base Camp Pendleton, USA on March 28, 2018. (Photo by Lance Cpl. Rhita Daniel/Reuters/U.S. Marine Corps)





A Turkish-backed rebel fighter fires ammunition as buses arrive at the Abu al-Zindeen checkpoint near the northern Syrian town of al-Bab transporting Jaish al-Islam fighters and their families from the former rebel bastion's main town of Douma after being evacuated from the last rebel-held pocket in Eastern Ghouta on April 3, 2018. Russia-backed regime forces have retaken control of 95 percent of Eastern Ghouta since February 18 through a combination of a deadly air and ground assault and evacuation deals. (Photo by Nazeer Al-Khatib/AFP Photo)





American troops from the Army's 10th Mountain Division from Fort Drum, N.Y., run from a helicopter as they seized the runway in Belet Huen, Somalia, December 28, 1992. Belet Huen is the last to be secured of eight points designated by the U.N. forces in Somalia as hubs for food distribution. (Photo by J. Scott Applewhite/AP Photo)





In this November 23, 2016, file photo, members of the New People's Army communist rebels with face painted to conceal their identities, reads a local paper at their guerrilla encampment tucked in the harsh wilderness of the Sierra Madre mountains southeast of Manila, Philippines. Justice officials have asked a court to formally designate the Communist Party of the Philippines and its armed wing, the New People's Army, as terrorist groups in a move that could further damage chances of a resumption of stalled peace talks. (Photo by Aaron Favila/AP Photo)





In this Friday, February 2, 2018, photograph, Yemeni militiamen and a soldier allied to the country's internationally recognized government offer Friday prayers as a Kalashnikov rifle sits in front of them on the outskirts of Sanaa, Yemen. (Photo by Jon Gambrell/AP Photo)





A U.S. Marine patrol walks across the charred oil landscape near a burning well during perimeter security patrol near Kuwait City on March 7, 1991. (Photo by John Gaps III/AP Photo)





Soldiers wounded during an attack in Tsentaroy, Chechnya, in December 1999. (Photo by Yuri Kozyrev/Noor Photo)





A U.S. Army crew chief flying on board a CH-47F Chinook helicopter observes the successful test of flares during a training flight in Afghanistan, March 14, 2018. (Photo by Tech. Sgt. Gregory Brook/Reuters/U.S. Air Force)





U.S. Marine Ryan Ramirez is assessed utilizing a capture system for Unmanned Aircraft Systems (UAS) drones at Camp Pendleton, USA on March 28, 2018. (Photo by Lance Cpl. Cutler Brice/Reuters/U.S. Marine Corps)





Libyan rebels clash with Gaddafi loyalists in Tripoli’s Abu Slim neighborhood in August 2011. (Photo by Yuri Kozyrev/Noor Photo)