When you are prescribing for a military member or their dependant it doesnt matter what state you are in, or whether the member uses civilian pharmacy or military pharmacy. When prescribing for a family member(which is another topic) you abide by civilian pharmacy rules/laws for the state. So if you are in a state other than your license they may not authorize the script, but this is very dependant on the nature of the pharmacist you are talking to. When prescribing for self it is no big deal through the military pharmacy civilian it can be a bit tricky depending on what you are getting. Ie...any pharmacist would give you albuterol mdi although they may not like the idea of giving you your zocor b/c they want to make sure somone is folowing the condition.
I think most physicians/pharmacists medically, ethically, and legally would tell you to steer away from this practice.
Ive found that once you are talking to a pharmacist and have a sound reason for whatever you need then they are willing to help out. Ex..I had PRK and 3 weeks later flew to Wisconsin on vacation for a long weekend. My FML eyedrops opened in mybag and I needed a replacement. I had no issues getting what i needed from walmart pharmacy in the middle of nowhere with a NC license.