A U.S. soldier of 2-12 Infantry 4BCT-4ID Task Force Mountain Warrior takes a break during a night mission near Honaker Miracle camp at the Pesh valley of Kunar Province August 12, 2009.
U.S. Marines of the 15th Expeditionary Unit (MEU) Fox Company "Raiders" sleep wearing respirators during a gas attack alert in an undisclosed location in the Iraqi desert on March 28, 2003.
Israeli troops sleep in an armored personnel carrier (APC) during a military operation in the northern Gaza Strip July 7, 2006.
US Marine Lance Cpls. Matthew Scofield and Jarrett Hatley, rest next to Hatley's dog after clearing compounds with Afghan National Army soldiers during Operation Tageer Shamal (Shifting Winds) on Jan. 4, 2012.
Israeli soldiers sleep in a military staging area near Kibbutz Mefalsim, just outside the northern Gaza Strip, June 27, 2006.
A British soldier sleeps in his quarters at Sangin camp in the southern province of Helmand June 10, 2007.
An Iraqi soldier sleeps next to his Kalashnikov rifle on the roof of a base in Baquba June 29, 2007.
A Canadian soldier from the NATO-led coalition rests on the muzzle of his rifle as he sleeps while riding in an armoured vehicle in Kandahar province November 16, 2007.
An Israeli soldier sleeps atop a tank near Kibbutz Kissufim, just outside the central Gaza Strip November 5, 2008.
Canadian soldiers sleep as a flare burns over them during a special operation at Sanjaray in Kandahar Province, May 18, 2009.
A Canadian soldier takes a nap after taking part in a search operation for improvised explosive devices (IEDs) in Kandahar May 21, 2009.
A U.S. soldier of Task Force Mountain Warriors sleeps in a base in Chapadera, at the Pesh Valley in Kunar Province August 5, 2009.
An Israeli soldiers sleeps after returning from the Gaza Strip to the Israeli controlled Erez crossing February 13, 2002.
A U.S. Marine from 1st Battalion, 8th Marines sleeps on a stretcher in the shade at an outpost in Kunjak, in southern Afghanistan's Helmand province, October 20, 2010.
NATO troops from Georgia sleep on a bench while waiting for a flight at Camp Bastion in southern Afghanistan's Helmand province, November 16, 2010.
A member of the U.S. Army rests in a hall, before flying to the U.S., at al-Asad air base in Iraq's western province of Anbar November 1, 2011.
A soldier from the United States' Army's Charlie Company, 1-12 Infantry, 4th Brigade, 4th Infantry Division, sleeps at Blocking Position one above Kamdesh in Afghanistan's Nuristan Province June 11, 2012.
An Israeli soldier sleeps atop an Armoured Personnel Carrier (APC) at an Israeli Defence Forces (IDF) staging area in the central Gaza border November 21, 2012.
A fighter from the Free Syrian Army's Tahrir al Sham brigade takes a break during heavy fighting in Mleha suburb of Damascus, January 25, 2013.
A member of the Free Syrian Army sleeps with his weapon on his lap in the city of Aleppo February 26, 2013.
