The military is not leaderless, wtf are you saying? If you read the article, you would see there's simply no Senate backed Chief of Staff nomination, those positions are occupied by generals long detached from ground-level tactical maneuver and decision making and are primaily responsible for policy making.

The U.S. military could still operate with literally the entire Executive Branch nuked into ash, and fight three separate fronts simultaneously across the globe within 72 hours. Not saying they would win any of those three fronts, simply that they can do it without the Joint Chiefs of Staff.