NBC News reports that "senior defense officials confirmed Monday that the al-Assad airbase in Iraq, where U.S. military are training Iraqi security forces, has been pounded almost daily by mortar attacks from ISIS militants, but claimed the attacks have been 'completely ineffective.'"
"Col. Steve Warren described the routine barrage of mortars aimed at al-Assad as 'nuisance attacks.' He said 'no U.S. personnel or U.S. equipment' have come under direct fire at the base."
"There are currently 320 Marines located at al-Assad airbase north of Baghdad to train, advise and assist Iraqi security forces. The Marines are also training some 200 Sunni tribesman who have joined the fight against ISIS. The total number of American military on the ground is expected to reach 3,000, as authorized by President Obama, by early spring."