I'd sure hope that the military M9 is suitable for use with NATO ammo! However, you may have heard about slide breakage with the M9. During the late 1980's the slides on a few M9's broke in half. The problem was traced to a large lot of 9mm ammo that was loaded VERY hot, and meant to only be used in submachine guns. Instead it was used in the pistols as well, causing the breakages.
So yes, the Beretta will handle standard NATO ammo. But at the same time, it's not an excuse to abuse the gun. I assume you just want assurances that your gun will last forever no matter what you shoot through it. The answer is always the same. No matter what you shoot, if you can afford enough ammo to break the gun you can afford a new gun anyway!