Hey Yacko,
while I was at TSA they had us fill out a form for Military duty. I would usually request the friday and monday for that weekend off to give me commuting time because of that exact situation. I would talk to a flight manager or a base manager if you have one. I'm not sure how it works, but they may have to allow you to set the friday and monday as two of your min. days off for military duty....couldn't tell you for sure. I never had an issue with it.