I was with VF-143 during OEF and our aircrew all carried Sig P226 or P228 one of the two which ever is a 9mm. The instructions at the time which are probably still in effect are that you had to use this pistol, you could not bring your own. The Sig is definitely better for us small handed people, but don't like the Sig's accuracy, I like a Glock better for shooting. As for an mp-5 or any other large weapon, there is no room in a jet and it would get lost when you ejected. The helo pilots did not carry large weapons with them either. But then again, they were carrying seals.