The last time an American president deployed the U.S. military domestically under the Insurrection Act — during the deadly Los Angeles riots in 1992 — Douglas Ollivant was there. Ollivant, then a young Army first lieutenant, says things went fairly smoothly because it was somebody else — the cops — doing the head-cracking to restore order, not his 7th Infantry Division. He and his troops didn’t have to detain or shoot at anyone.