I went back to my reserve unit twice during ground and sim training while i was at skywest, to get my takeoff and landings to stay current. i used my days off (one of the weekends in ground school) and the period between ground school and sims and jumpseated home without dropping orders. this was easy to do to because our class was huge and there was a week long backlog to get into the sim. It can be done, but I wouldnt firm anything up with your unit until the last minute.

Airlines for the most part take care of you when dropping military orders, and in my opinion the reason is you have a much less personal relationship with your chief pilot, than some office worker has with their boss. for this reason, you could keep taking off and it wont have the same effect, once again in my opinion. I met only one of my 3 chief pilots at SKW, and it was on the day that I turned in my manuals when I resigned. The downside however of not having that personal relationship is your CP might see all these military leave letters piling on his desk and will start paying special attention to you, but still theres really nothing he can do to you unless he catches you lying, jumpseating to hawaii while on mil leave, or breaking some other rule.