In this May 28, 2014, file photo, President Barack Obama arrives to deliver the commencement address to the U.S. Military Academy at West Point's Class of 2014, in West Point, N.Y. As Obama makes the case for U.S. airstrikes in Iraq, he’s drawing on a use of force doctrine he outlined less than three months ago, when the potential for deploying the military overseas appeared to be something he was trying to avoid. AP