This is not the policy the media likes when you're running for president, but it's the only thing any serious president can do. It's idiotic to stand there on the campaign stump and lay out in detail how you would fight a war. Not only are you giving away your strategy to the enemy, but you also have no idea how to anticipate what might actually happen on the field of battle.
So however much you may hear complaints that Trump is "short on specifics" here, this is really the ultimate in being presidential: