I don't have a problem considering NM or AZ the south, as opposed to the South (which tends to equate to the former confederate states). So Cal is geographically south, but has nothing in common with other states in the southern US. Colorado is not south geographically or culturally.
California was my point in my earlier post. They have the most people stationed in bases in CA, but that does not equate to per capita enlistment numbers. Thus, proving that it is not proximity of bases (or children of military personnel) that drives enlistment numbers. In my experience, enlisted parents tend to encourage their kids to be officers or choose another career entirely.