Please, Do not send him any type of weapon over there.
Both items are a bad idea in a hangar. For one any weapon taken into country (or shipped for that matter) has to be left in country and can not be brought back. This is not really a big deal if you are talking about a wrist rocket of a pellet gun but there are still larger dangers that he or his commandaing officer are thinking about. 15T is a Blackhawk maintainer I hold this MOS along with Apache and Cobra. We have a thing called FOD (forgien objects and debris or damage) It may not seem like much, but a bb sucked into one of the engines will cause more than $100,000 in damage possibly even leaving the AC without enough power to remian in flight depending on weight, temp, and altitude. To add to this there is a shinny little thing on the top of the ACFT called a AN/ALQ-144.

Each one of those little panes are lined on the inside with gold and cost about 30K each. A bad shot, poor judgement, pass through or just a richochet would just about end your sons carrer and the army can take up to a months pay for it plus all kinds of extra duty and headaches that I can assure you, he does not want. They can futher make his commander pay for the entire cost of the dammage.
You may look into some of the audible devices that mimick birds of prey and go off every 30 miuntes or so. They work about 80% of the time in hangars. We have two set up around our hangars and one set up in our covered wash rack and they keep them pretty clear.