They don't issue you guys sticks? Man, life in the army must suck. ;D
I've never had PI before, when I did my QL2 8 years ago we pepper potted through a huge patch of it, I was the only one in my section not to get it. I'm not sure if it's possible to be immune to it, but I certainly didn't have a reaction to it.
I don't want to hijack your thread, but this is a story I've got to tell. My Stepbrother was driving to work one day and he was having a smoke. He went to flick the butt out the window but the heater fell off and landed on his crotch. By the time he realized it was there it had burned through his jeans and left a nice 2nd degree burn on the top of his johnson. He went home and put some Polysporin on the burn and unfortunately he didn't know that Polysporin has an expiry date. Well the burn got infected, big time. His line of thinking is, "Something is wrong with my Johnson, I go to the health clinic". As soon as he showed them his infected johnson, they think what? That's right, STD. He got the swab which he thought was bad enough, then they took blood from his johnson too. Well he stands up and the doc says "here, hold this" and proceeds to give my brother the vial of "penis blood" (as he put it). The best part is he gets kinda woozy at the sight of blood let alone his own blood and especially where they got the blood from, and he faints. On the way down he hit his head on the examination table and gave himself a concussion. I tried not to laugh at him while he was telling me this, but honestly, how can you keep a straight face hearing this story. ;D
Cheers