All weapons used by the Air Force are reviewed to make sure they are legal. So if the Air Force issues you a weapon, you can use it. Be sure to use the weapon in the form it is issued to you. Weapons are evaluated to see if they cause unnecessary suffering. If they do they are illegal.
Some people are surprised at which weapons are legal.
For example napalm, flame throwers, white phosphorous, and nuclear weapons are all legal weapons. Biological weapons are also illegal.