Secretary of Defense Chuck Hagel said the troops arrived in Erbil, the Kurdish capital in northern Iraq, with the goal of developing a strategy to help rescue thousands of civilians trapped on Sinjar Mountain.
"As the president has made very clear, we're not going back into Iraq in any of the same combat mission dimensions we once were in Iraq," he said. "Very specifically, this is not a combat, boots-on-the-ground operation. We're not going to have that kind of operation. But short of that, there are things we can continue to do and we are doing."
The mission is in line with the goals outlined by the president last week when he announced airstrikes on Islamic State terrorists and humanitarian drops of food and supplies to the Yazidis, the minority sect who were chased up Mount Sinjar by ISIS.
The detachment of 130 Marines and special operators brings the total of U.S. troops in Iraq to above 900, and it was unclear whether the new deployment would run up against Obama's notice to Congress under the War Powers Resolution, which previously authorized 300 troops.
Hagel added Tuesday that Australia and France both pledged to increase their support of the operations in Iraq, on top of aid from the U.K.