You guys do me a favor and PM me if you have any maintenance problems with the M2 or the M3 Bradley, I will then direct you to the U.S. Army home page and we will discuss it. I taught maintenance for a couple of years at Aberdeen Proving Ground, Md. Engines, Transmissions, Electrical troubleshooting. I am a hull guy so I don't know the ISU or the turret too well. I loved teaching then and Love teaching now, only now I don't teach the Bradley Fighting Vehicle any longer.