If you want an answer favorable to the Navy you ask the Center for Naval Analysis (CNA). If you want an answer favorable to the Army you ask Institute for Defense Analysis (IDA) and if you want an answer which says the prefer solution is Air Force you go to Rand. For decades and decades and decades.
We all know this, but it is refreshing to hear someone in uniform and of high rank actually say it.
and if you want amything done, you go to the Marines.