No. And it never will be, the ground is the worst place on a battlefield if it came to hand to hand fighting, However, BJJ originates from judo which originates from Ju Jutsu, a martial art that the samurai used if disarmed on the battlefield. This included strikes, wrist locks, gouging, spitting, biting, throws, anything to kill the other person.
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There is no record of BJJ being used in wars. But these days armed forces are using jiu-jitsu as a training tool.