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Sgt. Richard A. Darvial and Spc. Corey C. Canterbury, Bayonet Company, 2nd Battalion, 327th Infantry Regiment, Task Force No Slack, fire mortar rounds from a ridge overlooking the Ganjgal Valley in eastern Afghanistan's Kunar Province. Dec. 2010.U.S. Army photo by Staff Sgt. Mark Burrell.

RCP77, (2nd Platoon, A Co., 2/34 BSTB, 2nd BCT, 34th ID) clearing a route east of FOB Mehtlar Lam, Laghman Province. June 2011.Submitted by the photographer, Sgt. Chuck Soliday, U.S. Army.

U.S. Army Soldiers from Alpha Company, 1st Battalion, 17th Infantry Regiment, engage enemy forces during Operation Moshtarak in Badula Qulp, Afghanistan. Feb 2010.DoD photo by Tech. Sgt. Efren Lopez, U.S. Air Force.

Air Force pararescuemen, from the 83rd Expeditionary Rescue Squadron, secure an area after being lowered from an HH-60 Pave Hawk during a mission in Afghanistan. Nov 2012.U.S. Air Force photo by Staff Sgt. Jonathan Snyder.

An AV-8B Harrier II sits on the flight deck aboard the amphibious assault ship USS Boxer (LHD 4), the flagship for the Boxer Amphibious Ready Group, deployed in the Arabian Sea. Oct 2013.U.S. Navy photo by Specialist 3rd Class J. Michael Schwartz.

U.S. Army Col. Benjamin J. Corell, Task Force Red Bulls commander, takes cover as a UH-60 Blackhawk lands upon a mountaintop during Operation Bull Whip in Laghman province, Afghanistan. March 2011.U.S. Air Force photo by Capt. Erick Saks.

Seaman Jonathan Keene and Boatswain's Mate Seaman Apprentice Jordan Selig clear the flight deck of the guided-missile cruiser USS Monterey (CG 61) after attaching chocks and chains to an MH-60R Sea Hawk helicopter, assigned to the Swamp Foxes of Helicopter Maritime Strike Squadron (HSM) 74. Oct 2013.U.S. Navy photo by Specialist 3rd Class Billy Ho.

A U.S. Marine with Weapons Company, 2nd Battalion, 6th Marine Regiment, takes a rest during a patrol out of Patrol Base Lambad, Nawa, Afghanistan. March 2012.U.S. Marine photo by Cpl Johnny Merkley.

Sailors assigned to Explosive Ordnance Disposal Mobile Unit (EODMU) 5, embarked aboard the dock landing ship USS Germantown (LSD 42), recover jettisoned ordnance in the Great Barrier Reef Marine Park area. Coral Sea. Aug 2013.U.S. Navy photo by Specialist 2nd Class Andrew B. Church.

The aircraft carrier USS Theodore Roosevelt pulls alongside the Military Sealift Command fleet replenishment oiler USNS Big Horn (T-AO-198) during an underway replenishment. Oct 2013.U.S. Navy photo by Specialist 2nd Class Sean Hurt.

U.S. Marines sit inside a CH-53E Super Stallion as they participate in an interdiction operation from Camp Bastion in Afghanistan's Helmand province. The Stallion is assigned to Marine Heavy Helicopter Squadron 462, which provided support for the 1st Battalion, 9th Marine Regiment during the operation in Gurjat Village. Oct 2013.U.S. Marine Corps photo by Sgt. Gabriela Garcia.

An amphibious assault vehicle (AAV) departs the amphibious dock landing ship USS Carter Hall (LSD 50). Carter Hall is a part of the Kearsarge Amphibious Ready Group and, with the embarked 26th MEU, deployed in support of maritime security operations in the U.S. 5th Fleet area of responsibility. Aug 2013.U.S. Navy photo by Specialist 3rd Class Sabrina Fine.

Cpl. Barrett Helzer from Alpha Company, 1st Battalion, 1st Marine Regiment, 1st Marine Division, kneels in front of Canadian soldier Pvt. Alexandre Douville as he fires an 84mm high explosive anti-tank round from a Carl Gustav recoiless rifle. June 2013.U.S. Marine Corps Photo.

U.S. Army Sgt. Nick Andrews, Infantry squad leader with Company C, 1st Battalion, 133rd Infantry Regiment, from Marshalltown, Iowa, looks into the valley from a mountaintop outside the village of Nengaresh, Afghanistan. Jan 2011.U.S Army photo by Staff Sgt. Ryan C. Matson.

Marines with Lima Company, 3rd Battalion, 5th Marine Regiment, assigned to Regimental Combat Team 2, conduct a patrol to suppress enemy activity in Sangin, Afghanistan. Jan 2011.U.S. Marine Corps photo by Lance Cpl. Dexter S. Saulisbury.

The last troop movement out of Iraq, which included more than 100 vehicles and 500 Soldiers, began in darkness, as the convoy left Contingency Operating Base Adder, near the southern city of Nasiriya, heading toward the border. As dawn approached, the last trucks crossed the border into Kuwait at Khabari Crossing. Dec. 2011.

Lance Cpl. Sean Matthews, UH-1N Huey crew chief, Marine Light Attack Helicopter Squadron 269 attached to Marine Medium Tiltrotor Squadron VMM-261 (reinforced), 24th Marine Expeditionary Unit, firing an M-2 .50 cal. machine gun from a Huey during a live-fire, bilateral counterattack drill. May 2012.U.S. Marine Corps photo by Staff Sgt. Robert Fisher.

A 100th Air Refueling Wing KC-135 Stratotanker extends its boom to receive and refuel a C-17 Globemaster III over Germany. Nov 2011. U.S. Air Force photo by Staff Sgt. Tabitha M. Lee.

Following the traditions of the NATO/ EuroTiger Meet, the Colorado ANG painted this F-16C in dramatic "tiger" markings for the Tiger Meet of the Americas. Aug 2001.Photo by Colorado Air National Guard.

US soldiers gather near a destroyed vehicle and protect their faces from rotor wash, as their wounded comrades are airlifted by a Medevac helicopter from the 159th Brigade Task Force Thunder to Kandahar Hospital. Aug 2011.Johannes Eisele - AFP/Getty Images