4. Pantsir-S1
A little smaller in stature, but with plenty of punch, the Pantsir-S1 (which sounds like a high school prank) carries 12 short-to-mid range surface-to-air missiles on the back of a small tank. It also houses two 30-mm automatic weapons. Basically, this thing is good for downing anything in the air. Good bye, Santa Claus.