Welcome, fellow soldier.
I've bought 2 BMWs from Sandy Sansing BMW just outside of NAS Pensacola in NW Florida. They've always given generous discounts for military members and it seems everyone aboard base who's dealt with them has also had a great experience. While they aren't strictly Military sales, you can call them at (850) 477-1855 and ask for Jurgen (Sales) and he should be able to provide any info you need when considering who to get your next BMW through.
Best of luck getting your new toy on order!!