To the Original Poster,

I am flying full time with one of the VIP Reserve C-12V/UC35 units (IP & ASO). JOSAC out of Scott AFB schedules all of our missions for the VIP flights (callsign PAT). Many of our missions are LONG days (both duty and scheduled flight time). Bidding long call reserve isn't feasible. Not only because of the flights, but also because there would be duty day conflicts. Your airline duty counts against military duty day. At least in the USAR it does. The flying is very rewarding and we fly both domestically & globally (not just in the ME). The C-12 course is 3+ months long and it's very good. Especially, the APS LOC-I training now done in the GROB 120TP. You do a lot of EP training in the actual aircraft that civilian King Air pilots only do in a sim. You mentioned the Guard and you might qualify for the Guard FWAATS course in WV through your 121 experience. I think it's around 3 weeks long. But there's very few slots per year with that course.

Good Luck!
G