So the US military is putting its soldier's lives on the line to promote Gracie JJ?
Ah, you poor naive waif.
I can tell you have never been in the military. For that matter, you do not seem to have remembered all the many stories of people in the military selling out the service for their own gain. There is actually a guy registered here who was caught in a sting operation trying to sell secrets to someone he thought might be hostile to his country.
But you have also missed the more likely chance that it is a case of a True Believertm looking at things through the eyes of his obsession.
You see, the military really does not put things together. People in the military put things together for the military. And if those people have a deeply held belief that something is a certain way, they will see it in any data they pick up. They do not mean to lie, they just have those preconceptions.
Take a look at yourself. You heard that there were no cases of a fight that did not have grappling. Let us put aside the definition of grappling (grabbing) for a second. You heard that and then made the assumption that an art that specialized in grappling would be more effective. Of course, to specialize in one thing means to leave others lagging behind so striking would be left behind in an art that that specialized in grappling. But of course as we said, there seems to be no mention of whether there were any fights that did not involve striking. You see how your preconceived notions and desires clouded your way of looking at things? Do you realize that people involved in something like putting together an art for the military might suffer the same problems?
Next, you should consider what the sample for the studies is. You may be surprised, but grappling has been in the military H2H manuals for several years. I remember reading a thread at e-budo maybe 4-5 years ago where one of the participants in putting together the system talked about why they put in the groundfighting stuff. So it looks like the guys that were taken for the sample already were learning some GJJ. So stories of them using it if that is the case, is only to be expected.
What if the sample had instead looked at the H2H experiences over the decades that the ROK had while fighting North Korean commandos, VC and others? They learn TKD. I dare say I would expect that a series of interviews with ROK soldiers who fought bare handed might reveal that they used a lot more kicks than grappling. People do as they are trained.
Finally, do not put your faith in anything. Some people seem to grab some sort of security blanket to try to convince themselves that what they do is the baddest thing in town. Some Bujinkan members try to say that an art as old as ours claims to be must be good otherwise it would not have survived. Having seen a few who spout that, I have to say the art would have died off long ago if they were the ones in charge of staying alive long enough to train a replacement. Pointing to the military as some sort of proof that what you do is combat effective sounds like that kind of reliance I am talking about. Do you even know the huge amount of idiots that taught stupid things to the military based on some sort of proof of its effeciency? Having gone through some of the military training firsthand, I can't say that the military gets things right all the time. So my advice would be to not rely on what others do or their perceived successes to bolster your case for your training.