The heavy losses inflicted by ISIS is on top of the Iraqi military running out of Hellfire missiles six days ago.

Via ABC News:

The Iraqi military ran out of Hellfire missiles six days ago, and though the U.S. is rushing more missiles into the country, Iraq has only two modified Cessna aircraft to launch them in their battle against the radical Islamic militia ISIS.

ISIS has captured 28 tanks and shot down three helicopters, a significant percentage of the government force, and the militia killed an entire Iraqi Security Force brigade in the last couple of days at the border with Syria, which ISIS now controls.

The losses have left the Iraqi military with no offensive capability, and no real air force.

With the brigade at the border at Al Qaim wiped out, ISIS now controls the territory from Rubiya to Al Qaim. The tribes in Al Qaim tried to fight them, but ISIS unleashed a major artillery barrage, then a major assault, and they could not hold the back.

Taking Al Qaim opens up the entire Euphrates Valley to the insurgents, and ISIS has a safe haven across the border in Syria, which makes air strikes difficult.