Accepting/Declining Guard Slots

[Flaco]

I am going to interview (hopefully) with more than one Guard unit this summer. If I happen to get accepted on my first interview (could be early May), can I still interview at other units later on and accept if I get the slot? If so, how should I go about declining the other unit's slot? If I get the first slot, how much later could I turn it down? (some units don't even interview until September) The only reason why I would do this is if I had a choice between two units, and I liked one locale or unit more than the other. I just don't want to burn any bridges. Anyone have any advice?

- Flaco