Yup, I was in the Army at Ft. Benning for 3 years. SFC Larsen went down to Brazil, learned BJJ, and brought it back up here. It's pretty big with the Ranger Batts. I got to attend the first phase.....there's still 3 phases right? The 1st phase is basic BJJ, 2nd phase encorporates more striking, and the 3rd phase is mostly striking with weapons training.
Their BJJ is really mixed in with a "Sambo-like" style IMO. Their pride fighter, Damien Stelly (not sure about spelling) was a world Sambo contender. They teach leg locks, knee bars, & ankle locks right off the bat.
The test at the end of the first phase includes achieving the clinch with someone with boxing gloves on. You can't hit them, but they can knock the shit out of you. It's fun getting your head rocked a little.
SFC Larsen still running things down there? Watch out for Damien Stelly, he's their champ down there.
Have fun! Karma out to you, brother.