Ah, the whole "Fleet Reserve" thing factoring in. Makes sense.
Didn't know if this was some boondoggle the retiree crowd was keeping to themselves. How would that play with SELRES doing it as their CIV job? I know the NOSC I was going to drill at had real issues with me working in Dubai, Saudi and Russia, but couldn't produce anything saying I was prohibited from it. (I stayed IRR mostly due to this, and expecting me to do at least 10 hours a week Admin crap. For free)
There's plenty of SELRES who work out of the country.
Depending on what the billet is, you may have to do work during the week, but Patriot Drills are not the answer. If they don't have additionals, you shouldn't be working for free (for the most part...).