Washington has allocated more than $60 billion since 2002 to train and equip Afghan troops.

US Marine PV2 Eileen M. Schnetzko stands on guard at Bagram airport, March 2, 2002. US troops were based at Bagram, north of Kabul.
US Marine PV2 Eileen M. Schnetzko stands on guard at Bagram airport, March 2, 2002. US troops were based at Bagram, north of Kabul.  (REUTERS/Mario Laporta)

There were some 4,000 US troops based in Afghanistan as part of the international war against terrorism.

Land-mine detectors stand by as a US Army soldier, right, maneuvers Hermes the robot into a cave to detect mines, traps, and other unexploded ordnance as well as weapons or equipment possibly hidden by Taliban or al-Qaida fugitives in the eastern border town of Qiqay, Afghanistan, Monday, July 29, 2002.

Land-mine detectors stand by as a US Army soldier, right, maneuvers Hermes the robot into a cave to detect mines, traps, and other unexploded ordnance as well as weapons or equipment possibly hidden by Taliban or al-Qaida fugitives in the eastern border town of Qiqay, Afghanistan, Monday, July 29, 2002.  (AP Photo/Wally Santana)

The war in Afghanistan was the first time robots were used by the US military as tools for combat. Proponents of the robots believed sending them first into caves, buildings, or other dark areas will help prevent US casualties.

Afghan villagers watch as US soldiers from the 82nd airborne's Bravo Company search a house for suspected Taliban and al-Qaida forces in the central part of the Baghran river valley during the finishing stages of "Operation Viper" in Helmand Province, southern Afghanistan on Monday, February 24, 2003.

Afghan villagers watch as US soldiers from the 82nd airborne's Bravo Company search a house for suspected Taliban and al-Qaida forces in the central part of the Baghran river valley during the finishing stages of "Operation Viper" in Helmand Province, southern Afghanistan on Monday, February 24, 2003.  (AP Photo/Aaron Favila, Pool)

Suspected enemy fighters were spotted taking ambush positions in the area a few weeks ago by US troops as they went on patrol as part of the ongoing war against terrorism.

A US special forces soldier, left, watches while Afghan militia wait in line to turn in their weapons at a military base in Kunduz, Afghanistan, October 22, 2003.

A US special forces soldier, left, watches while Afghan militia wait in line to turn in their weapons at a military base in Kunduz, Afghanistan, October 22, 2003.  (REUTERS/Richard Vogel/Pool)

A long-awaited UN-sponsored project to disarm, demobilize, and reintegrate 100,000 soldiers across Afghanistan was under way in the north, a key step that was hoped would bring eventual peace to this war-torn country. The "New Beginnings Programme," which lets soldiers exchange their weapons for jobs, began in the northern province of Kunduz.

A Chinook helicopter hovers over US troops in the village of Jegdelic, about 56 miles southwest of Kabul, Afghanistan, in this picture taken on December 24, 2004.

A Chinook helicopter hovers over US troops in the village of Jegdelic, about 56 miles southwest of Kabul, Afghanistan, in this picture taken on December 24, 2004.  (REUTERS/Ahmad Masood)
A US military helicopter carrying up to 20 American troops crashed during an anti-guerrilla mission in eastern Afghanistan, US officials said. The fate of those on board was not immediately known....

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