flack jackets = teh suck, dont stop shit. Flak jackets where issued in vietnam, all they do is stop shrapnel.
The body armor we use is made by point blank, and is alot better than the old flak jackets. The shell is rated to stop a 9mm on its own. The plates are inserted into the shell, and the are rated to stop a 7.62mm FMJ.
http://www.globalsecurity.org/military/systems/ground/interceptor.htm