The Veterans Site Blog shares.................Welcome to MCRD, Marine Corps Recruit Depot! Those first moments make an impression that lasts for the rest of your time in the Corps. This DI is cut. He is clear as glass and very forceful. Do you hear a single um, ah, or hesitation in his voice? You wouldn’t in your wildest dreams defy him. Yes sir! and Aye, sir! become the totality of your vocabulary. You ask nothing: you only obey, with speed. This is the DI’s room and you know it.