The American presence in Iraq is also under political threat from the Iraqi parliament, which has backed plans to expel foreign troops from the country.
US soldiers and journalists stand by the edge of a huge crater at the Ain al-Asad air base today. The crater was caused by one of the Iranian missiles which were fired at the base in retaliation for the death of Qassem Soleimani
A US soldier in his military gear walks past a heavily damaged part of the Ain al-Asad base, with a huge pile of rubble lying in an indoor part of the compound
Rubble and debris are seen in a pile at the Ain al-Asad base in Iraq today after the Iranian missile strikes damaged facilities at the base which houses US forces and troops from the US-led coalition against ISIS
A bulldozer picks up rubble and debris at Ain al-Asad air base today, five days after the Iranian missile attack which Tehran said was revenge for the drone strike that killed Soleimani on January 3
The air base in Iraq's western Anbar province, around 100 miles west of Baghdad, is shared with the Iraqi forces and houses around 1,500 members of the US military and US-led coalition fighting ISIS.
The base was hit by more than 10 Iranian missiles last Wednesday in retaliation for the US drone strike which killed Iranian general Qassem Soleimani five days earlier.
The missile strike was Iran's most direct assault on America since the 1979 seizing of the US embassy in Tehran, which sparked a 444-day hostage crisis.
'There were more than 10 large missiles fired and the impact hit several areas along the airfield,' said Col. Myles Caggins, a spokesman for the coalition fighting ISIS forces in Iraq and Syria.
He added that the explosions created large craters, knocked over concrete barriers and destroyed facilities that house dozens of soldiers.
Lt Col Antoinette Chase told reporters that the troops were in bunkers on the night of the attacks but could 'feel everything shaking.'
Today most soldiers walked around without any body armour amid the base's large tents and street signs written mostly in English.
Six US soldiers stand amid the rubble at Ain al-Asad today. No American troops were killed or seriously harmed in the missile attack, although some were treated for concussion after the blast
A crater caused by the Iranian attack last Wednesday, which came at the height of the Middle East crisis. Donald Trump declared victory in the stand-off after no US troops were harmed in the missile barrage
A US soldier stands by the side of the crater, with vehicles parked next to the surrounding rubble, after a missile attack which marked Iran's most direct attack on America since the 1979 embassy attack and subsequent hostage crisis
Twisted building materials lie in a pile of debris at Ain al-Asad air base today. US officials say military trailers and other facilities were damaged in the missile attack last Wednesday
A US soldier poses for a picture while bulldozers clear rubble and debris at Ain al-Asad air base in Anbar on Monday. Troops received notification the missiles were on their way thanks to early warning systems, US officials say