Here's a reply I made to a poster who created a thread about pwning a Navy SEAL while rolling one day. It talks about why the Army trains combatives.
Guys,
Here's my background to establish my credibility. Been in the military since 1990 (first as an enlisted guy then an officer). Served in several units, 1st CAV Division, 101st Airborne (Air Assault), and 1st Ranger Battalion. I have worked with the SEALs along with many other US and foreign specops units. I've deployed to Kuwait, Haiti, Kosovo, Afghanistan, and Iraq.
The threadstarters story is entirely plausible. I don't know him but I choose not to doubt his veracity. The problem with hand to hand combat in the services is that until recently it didn't get a lot of attention. There is only so much time in the training day and hand to hand combat just wasn't important. Of course you always had the commander who had studied martial arts as a kid and made his guys train but he was the exception rather than the rule. I know for a fact that in the mid-90's SEAL Team 6 was training Kali stickfighting. In the Army right around the same time 2nd Ranger Battalion began incorporating BJJ into their newly created hand to hand combat program. Currently, a modified version of hand to hand combat program created by the Rangers is being taught Army wide under the name of the Modern Army Combatives Program. It incorporate the basics of BJJ (groundfighting), wrestling, Muay Thai, Judo, and stickfighting from Kali.
The real issue with combatives again is training time. Think about how long it takes to get really good at BJJ. If our soldiers spent that much time training BJJ they would not be able to do anything else. They couldn't do maintenance on their tanks or bradleys. They couldn't go to the range to practice marksmanship. They couldn't go to the field to work on small unit exercises. So essentially what you have is a basic system of fighting with the express purpose of instilling traits in soldiers that are important on the modern battlefield - tenacity, personal courage, self-confidence and the desire to close with the enemy. Secondarily, you have soldiers who can transition from armed to unarmed combat against a trained or untrained opponent.
Matt Larsen, the head instructor at the Combatives school at Ft Benning has a saying, "Do you know who wins the unarmed combatives fight? The person whose buddy gets their first with a gun."