Originally Posted by Flying Elvis

#1: A real gun belt. Safariland and G&G make good low cost synthetic ones that will be gtg with most airline uniforms for under $30. You can buy nicer ones from several guys. The Belt Guy. Bullhide belts is another good option. A lot of guys buy nylon belts (you can get them at the PX) which is great if you shoot a lot on your own, but otherwise, I'd recommend you just get a belt you can wear with your uniform later. But regardless of which one, bring one. I can't emphasize this enough.

As others said, band aids, athletic tape, and even some padded tape. Tac boots if you've got em. Tennis shoes work just as well. Spray on sunscreen (or Purell to get the lotion off your hands - sweat will make the gun grip slippery enough).

Speed Loader.

Go easy on the civilian clothes.