If you don't already have your ATP most regionals will require you to either stay (~18 months) or pay back their costs. Usually around $3000.
I'm a military guy who retired non current and am at endeavor right now. Commuting from Greenville would probably not be an issue at all. Commuting through Atl as a regional guy is not the best of scenarios, but doable for the short term. The Delta guaranteed interviews wouldn't apply to you unless you're planning on staying at endeavor for 3-4 years. But you can still get hired OTS (off the street). Feel free to pm me if you have specific questions.
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