Thanks Surferdoc. That would explain the "Army" officers use of it in "Scent of a woman". I believe Al Pacino played the Army vet who had been blinded in Nam. He may well have been a Ranger, but It's been about ten years since I saw the movie and all I remember for sure is his Army uniform.
If that's the case, they were using a wimpified version of what we had in infantry units in the 70's.
Today's modest "ooo-ra" is nothing like the uulation we had then. It was akin to a 'barbaric yawp' (Dead Poets Society) and came from the gut out the back of throat. Oh, yeah, I can still do it!
Done right, it brings a priapristic response to the true grunt.