There is no such thing as a "cop killer" round of ammo. There is such a thing as armor piercing and all handguns can use armor piercing ammo. Getting the ammo is the trick. Not only that, a .44 mag at close range will shoot through vests without armor piercing ammo, so will any number of rifles and other handguns. The fact is these anti-gun a**hats are trying to distract from the real danger, muslims and other insane a**hats that want to kill people. Had the rest of the troops been armed only a few would have been killed before the crazy muslim ba*****d was brought down.
The bottom line is that none of the people at fort hood had on body armor. A .22 long rifle round would have done just about the same amount of damage as the 5.7 did. I understand he also had a .357 magnum, but that seems to be lost in the news media hype.