All airlines are compatible with military reserves, with the possible exception of a few bottom feeders who will try to violate federal law if they can get away with it. But the government is actually getting more hard-assed about that kind of thing, so I doubt you would have a problem in the future,
The golden rule is to avoid a double commute...ie you want to live in either your airline domicile or your military duty station.
Also it is not very hard to switch reserve/guard units if you are a non-pilot. Pilots can switch too but they need to find:
1) An opening
2) In a unit located where you want to be
3) That flies your airplane (or you have to get retrained on a new airplane).
Research regional domiciles and try to get into a unit in a part of the country which is close to possible regional jobs. There is more regional activity in the eastern US due to higher population density.