USAF Security Forces, the vest was new directly from Point Blank as replacement for our old style body armor. I lucked out and got one of the few they recieved to T&E. Seems our purfumed princes was us to go with a "second chance" style of armor instead.
You got me wondering, I'm going to do some more research and see if I can verify that the vest is indeed the FSBE like I was told. I've never looked for a label or other markings as I got the vest on a extremly busy day.
Some troops wear their pouches directly attached to the vest, but I don't wear it all the time so I just "bulk up" and wear my SOE vest over the top of the body armor.