Sandrich
Think about this for second, an F-15 ANG pilot position will consume a minimum of 7-8 days a month to be current and mission ready. A B737 low seniority FO will be at his airline 14-16 other days, maybe more, maybe less, if he lives at hs ANG unit maybe he can "overlap" the two by doing Guard while on reserve.
What I'm saying is that doing the two is a serious commitment, demanding of time and talents. The standards for the ANG F-15 guy are EXACTLY the same as the AD guy.
Be very serious!
GF