I have a blackbelt in Taekwon-do. I am a 9 time gold medalist and a national champion. I was on the Alberta team in 1993-1994. I will be the first one to tell you that few TKD techniques are useful for soldiering. Why? Because many of them are complex kicks which involve spinning or other finite motor movements. Besides, can you see a man with all his battle gear on, rifle, and ruck doing a spin kick? Or even kicking above his own groin?
The only useful kicks from TKD are the side kick (you can break someone in half with one of those) and the front kick (can be done fast to hurt someone or kick open doors, etc.) Both of those can be learned in a few months and mastered over years. As for all the other patterns and crap, they are good to help you learn reaction time, speed and how to use gravity, aka dropping power, when you strike but again require YEARS to master. Thus TKD is not practical to teach recruits in BMQ or whatever.
So in my opinion and after years in TKD, as well as meddling with judo, jiujitsu, knife fighting, karate, etc. I have learned that knowing TOO MANY MOVES = FREEZING IN A FIGHT!!!
It has it happened to me lots. When I was the TKD champ in highschool and after I had was in a few street fights and at the beginning I didn't know what to do. I froze. The problem was I had 100 things in my mind but had to think about what to use. That is the problem. When adrenaline flows, you cannot think! YOU REACT. SO if you practice a few moves a million times, you will be better off than practicing a million different moves a few times. Variety is not the key.
What one needs to learn is how to instinctively react to an attack without having to memorize specific techniques. GROSS BODY MOVEMENTS that just come out of you whether you are standing, sitting, surprised or ready.
Go to www.attackproof.com and you will see what I mean. This is the ultimate fighting system. And it works and shows why it is superior to jiujitsu, karate, tkd, etc.