Secretary of the Navy Ray Mabus said recently in a December interview that while GOP President-elect Donald Trump can roll back social change in the military, doing so will make the force weaker. Mabus, who has served in the position longer than anyone since World War I, has overseen significant social changes in the military and caused a lot of consternation in the process. Now, in a wide-ranging interview with The Washington Post, he’s warning that if Trump rolls back social change in the military, he should admit that it will damage the force. “You make the decisions you think...