The military term is called “bearing” and what its intended to teach is to “keep your head” even in the midst of the unexpected (which pretty much defines combat). Instead of freaking out, take stock of what’s happening around you and make a decision that accomplishes the strategic directive. In close order drill, it’s maintaining discipline and conformity. In the fluidity of the battlefield, it may be different, but the mindset is the same.

Going stone-faced and leaving your rifle, no of course not. But, maintaining military bearing under pressure, absolutely imperative.

The skills practiced in a drill competition and battle are not really the same (though related, calm under fire, preciseness, etc)