If Congress does not undo the sequester for the coming years, the Pentagon will continue making drastic cuts. Last week, an advisory board gave Defense Secretary Chuck Hagel a menu of options for scaling back — none of them very palatable. One option would cut the Army to 380,000 troops, far smaller than what’s currently planned. If anything, though, the Pentagon is slow to the game. Defense-minded think tanks have developed their own recommendations for what a smaller Defense Department should look like. Nora Bensahel is director of studies at the Center for a New American Security.