Which branch?

I need to know this for a story I'm writing. And I'm not sure at this point! LOL

Lorne is Air Force, right?
Are Reynolds and Dixon (Adam Baldwin's character from Heroes) both Marine? Or is Reynolds Air Force?

I checked the omnipedia at Gateworld, but it doesn't say....

Where can I find this?

Anyone happen to know where I might be able to find a necklace like this:



It's that one Sam wore when she got sucked into the AU this season. I just got a dress with a similar neckline and think it would look great! :-)

Thanks!