The US Army let the Rangers take the lead and form Modern Army Combatives Program, or MACP. I should lay out my background, having taken lessons in Tae Kwon Do (ITF), Kempo Karate, and Tomiki Aikido (non-competitive). Never made black belt in any system, but I've been in a few fights and lost teeth because of it (my poor parents dental bills).
But on to MACP. There are 4 levels. I've been through Level 1 about three times now. Not bad training for something designed to take someone who has never boxed, wrestled, or been in a fight and teach them to squirm around on the ground to achieve a bar or a choke. But after the first time through Level 1 is pretty boring. Lots of ground work, lots of repetition, not a lot of fun. A lot of emphasis on Gracie Jiu Jitsu style grappling. Level one would equal 40 "mat hours" for someone keeping track for a martial art that tracks mat hours.
Level 2 started off with a Level 1 review. Then all the things to counter Level 1. It took a while to move into striking, but at least now we are covering truly new material for most of us. The kicks are from Muai Thai, the punches are from Boxing. Level 2 would be 80 "mat hours."
Levels 3 and 4 are Instructor levels, Level 3 can certify Level 1, and Level 4 can certify Level 1 and 2. This is to set up units for self sustaining training. Both Level 3 and 4 are 160 hours of training each. So to go from Level 1 to level 4 it is a minimum of 480 hours of training.
In the end, we are back where we started two thousand years ago in the Gladiator Arena of Rome, total fighting (Pan = total, kratos = fighting. Put them together and you have pankration) . Too bad we lost so much of our western history and had to borrow so much Jiu Jitsu to get there.
Of course the Asian cultures wrote down and codified schools of martial arts almost compulsively, whereas our records of "Pankration" are from pottery and statues. Still, as a fighting style MACP works, as a functional martial art it lacks art. But then again neither gladiators nor soldiers have any need to be graceful, artistic, or even at peace with themselves.
The good? Well you get hit in MACP. This is something that a lot of schools don't do. Learning a martial art is not learning how to fight. The Bad, it takes a while to go from learning moves to learning how to fight. Really it has only been this second half of Level 2 where people are starting to move like fighters instead of boxers or wrestlers.