U.S. troops leaving Afghanistan
A U.S. soldier from the 3rd Cavalry Regiment prepares his Mine-Resistant Ambush Protected (MRAP) vehicle for a mission on Forward Operating Base Gamberi in the Laghman province of Afghanistan, Dec. 12, 2014.
While most troops are heading home from Afghanistan, some will stay on as advisors to the Afghan National Army.
Leaving Afghanistan
U.S. soldiers from the 3rd Cavalry Regiment play video games after returning from a mission on Forward Operating Base Gamberi in the Laghman province of Afghanistan, Dec. 12, 2014.
Leaving Afghanistan
A U.S. soldier from the 3rd Cavalry Regiment takes inventory of unused equipment on Forward Operating Base Gamberi, which remains part of the ongoing Operation Resolute Support in the Laghman province of Afghanistan, Dec. 11, 2014.
Leaving Afghanistan
A shadow cast by a U.S. soldier from the 3rd Cavalry Regiment shades spent brass strewn on the ground during a joint training mission, near Forward Operating Base Gamberi in the Laghman province of Afghanistan, Dec. 12, 2014.
Leaving Afghanistan
The flag of Afghanistan flies over an Afghan National Army post near Forward Operating Base Gamberi in the Laghman province of Afghanistan, Dec. 11, 2014.
Leaving Afghanistan
A U.S. soldier from the 3rd Cavalry Regiment rides in an Mine-Resistant Ambush Protected (MRAP) vehicle during a mission near Forward Operating Base Gamberi in the Laghman province of Afghanistan, Dec. 12, 2014.
Leaving Afghanistan
A U.S. soldier from the 3rd Cavalry Regiment walks with the unit's Afghan interpreter before a mission near Forward Operating Base in the Laghman province of Afghanistan, Dec. 11, 2014.
Leaving Afghanistan
A U.S. soldier from the 3rd Cavalry Regiment rides in a Mine-Resistant Ambush Protected (MRAP) vehicle during a mission near Forward Operating Base in the Laghman province of Afghanistan, Dec. 12, 2014.
Leaving Afghanistan
U.S. soldiers from the 3rd Cavalry Regiment listen to a translation of an advising meeting at an Afghan National Army base near Forward Operating Base in the Laghman province of Afghanistan, Dec. 13, 2014.
Leaving Afghanistan
Contractors use a machine to capture biological data of local Afghan men near Forward Operating Base in the Laghman province of Afghanistan, Dec. 14, 2014.
Leaving Afghanistan
A U.S. soldier from the 3rd Cavalry Regiment pets a contractor's explosive detecting dog while riding in a Mine-Resistant Ambush Protected (MRAP) vehicle during mission near Forward Operating Base in the Laghman province of Afghanistan, Dec. 14, 2014.
Leaving Afghanistan
A U.S. soldier from the 3rd Cavalry Regiment helps a contractor search a car for explosives near Forward Operating Base in the Laghman province of Afghanistan, Dec. 14, 2014.
Leaving Afghanistan
U.S. soldiers from the 3rd Cavalry Regiment interact with men selected to be biometrically screened near Forward Operating Base in the Laghman province of Afghanistan, Dec. 14, 2014.
Leaving Afghanistan
A U.S. soldier from the 3rd Cavalry Regiment walks with his rifle, after returning from a mission at Forward Operating Base Gamberi, in the Laghman province of Afghanistan, Dec. 15, 2014.
Leaving Afghanistan
U.S. soldiers from the 3rd Cavalry Regiment eat their lunch from to-go containers before a training mission at Forward Operating Base Gamberi, in the Laghman province of Afghanistan, Dec. 15, 2014.
Leaving Afghanistan
Corroded rounds of machine gun ammunition sit in a pile after being discarded by U.S. soldiers from the 3rd Cavalry Regiment, during a training mission near Forward Operating Base Gamberi, in the Laghman province of Afghanistan, Dec. 15, 2014.
Leaving Afghanistan
A crew member mans a machine gun on a U.S. Blackhawk helicopter as it flies over the city of Jalalabad after taking Brigadier General Christopher Bentley to inspect an Afghan National police installation in the Nangarhar province of Afghanistan, Dec. 16, 2014.
Leaving Afghanistan
Afghan National police officers look at a U.S. soldier providing security during a visit by U.S. Brigadier General Christopher Bentley to an Afghan National Police installation in the Nangarhar province of Afghanistan, Dec. 16, 2014.
Leaving Afghanistan
Brigadier General Christopher Bentley, right, greets Afghan police officers with Nangarhar provincial chief of police, Major General Fazal Ahmad Shirzad during a visit to an Afghan National Police installation in the Nangarhar province of Afghanistan, Dec. 16, 2014.
Leaving Afghanistan
Afghan National police officers demonstrate their training during a visit by U.S. Brigadier General Christopher Bentley to an Afghan National Police installation in the Nangarhar province of Afghanistan, Dec. 16, 2014.
Leaving Afghanistan
Afghan National police officers demonstrate their training during a visit by U.S. Brigadier General Christopher Bentley to an Afghan National Police installation in the Nangarhar province of Afghanistan, Dec. 16, 2014.
Leaving Afghanistan
U.S. soldiers play volleyball at Forward Operating Base Fenty in the Nangarhar province of Afghanistan, Dec. 21, 2014.
Leaving Afghanistan
Afghan National police officers stand in formation during a visit by U.S. Brigadier General Christopher Bentley to an Afghan National Police installation in the Nangarhar province of Afghanistan, Dec. 16, 2014.
Leaving Afghanistan
U.S. soldiers from the 3rd Cavalry Regiment fly in a CH-47 Chinook helicopter from the 82nd Combat Aviation Brigade to an advising mission at an Afghan National Army headquarters for the 203rd Corps in the Paktia province of Afghanistan, Dec. 21, 2014.
Leaving Afghanistan
A crew member of a CH-47 Chinook helicopter stands above U.S. soldiers from the 3rd Cavalry Regiment as they fly to an advising mission at an Afghan National Army headquarters for the 203rd Corps in the Paktia province of Afghanistan, Dec. 21, 2014.
Leaving Afghanistan
A U.S. soldier from the 3rd Cavalry Regiment shields himself from the rotor wash of a UH-60 Blackhawk helicopter after being dropped off for a mission with the Afghan police near Jalalabad in the Nangarhar province of Afghanistan, Dec. 20, 2014.
Leaving Afghanistan
A contractor drags his bag out of a housing complex at Forward Operating Base Gamberi which remains part of the ongoing Operation Resolute Support in the Laghman province of Afghanistan, Dec. 11, 2014.
Leaving Afghanistan
A construction worker walks through an Afghan police station constructed by ISAF near Jalalabad in the Nangarhar province of Afghanistan, Dec. 20, 2014.
Leaving Afghanistan
U.S. soldiers from the 3rd Cavalry Regiment load into a CH-47 Chinook helicopter for an advising mission to an Afghan National Army base at Forward Operating Base Fenty in the Nangarhar province of Afghanistan, Dec. 21, 2014.