U.S. Air Force Capt. Matthew Clouse, a chaplain, talks with a Belizean boy waiting to see a doctor during New Horizons Belize 2014 in Progresso, Belize, April 11, 2014. The medical training exercise gives U.S. and Canadian military doctors and nurses the opportunity to work with their Belize counterparts to provide free care to Belizeans.
U.S. Air Force photo by Tech. Sgt. Kali L. Gradishar
Defense Secretary Chuck Hagel listens to a briefing on advancements in prosthetics from representatives of the Defense Advanced Research Projects Agency, or DARPA, at the Pentagon, April 22, 2014. The program showcased DARPA technologies and how they contribute to U.S. national security.
DOD photo by U.S. Marine Corps Sgt. Aaron Hostutler
U.S. Army Spc. Josh Lueken provides security on Observation Post English in Afghanistan's Logar province, April 18, 2014. Lueken is assigned to the 10th Mountain Division's Company B, 2nd Battalion, 87st Infantry Regiment, 3rd Brigade Combat Team.
U.S. Army photo by Capt. John Landry
U.S. helicopter crews prepare to take off from the flight deck of the USS Bonhomme Richard, April 21, 2014, to assist South Korea's search operations for the Sewol, the ferry that sank April 16 off the coast of Jindo island.
U.S. Navy photo by petty Officer 2nd Class Adam D. Wainwright
Air Force Lt. Col. Matthew Woolums, right, briefs Massachusetts Gov. Deval Patrick, center, and Air Force Maj. Gen. L. Scott Rice, left, adjutant general of the state's Guard, before the start of the 2014 Boston Marathon in Hopkinton, Mass., April 21, 2014. About 600 Massachusetts Guardsmen assisted local authorities to ensure the event would be as safe as realistically possible. Due to a record number of runners, Guardsmen from numerous states, including Rhode Island and Maine, augmented the Massachusetts Guard's specialized units. Woolums commands the 1st Civil Support Team, Massachusetts National Guard.
Massachusetts Air National Guard photo by Capt. Thomas Kennedy
An F-16 Fighting Falcon taxis after a defensive training run during Coronet Cactus on Davis-Monthan Air Force Base, Ariz., April 7, 2014. The annual exercise provides student fighter pilots with realistic training, including air-to-air combat and dropping inert and live ordnance.
U.S. Air Force photo by Staff Sgt. Jonathan Snyder
U.S. paratroopers conduct infantry training near Osoppo, Italy, April 8, 2014, to prepare for an upcoming exercise in Slovenia. The paratroopers are assigned to Company C, 2nd Battalion, 503rd Infantry Regiment, 173rd Infantry Brigade Combat Team.
U.S. Army photo by Markus Rauchenberger
U.S. Marine Corps Lance Cpl. Trevor Washington uses the optic lens on his weapon to scan the area while providing security during a patrol in Helmand province, Afghanistan, April 10, 2014. Washington, an intelligence analyst, is assigned to Weapons Company, 1st Battalion, 9th Marine Regiment. The patrol was performed to maintain a security presence within the area of operations.
U.S. Marine Corps photo by Lance Cpl. Zachery B. Martin