Stopping of bullets might be physically impossible with mere armor, though (or we'd have done it today already) . . .
Uh, we have
done it today. Ever hear of Kevlar vests? Okay, they don't deflect or disintegrate bullets, but they'll stop a bullet from penetrating the body.
Only low powered bullets and not from point blank range. That's why you rarely see cops wearing bullet proof vests. Against higher power weapons, they just don't work that well.
Anyway, we saw Worf create a personal force field in A Fistful of Datas.