And realize.....in the ANG (not sure about the RES....but probably the same) There are all kinds of active duty tours all over the planet that a part timer can pick up. 5 years wouldn't be hard to get at all over the rest of your military career with some military leave tossed in... if it is a goal of yours. At the least, your traditional retirement will be very nice. Those 15 years will not be wasted if you leave AD and retire from the reserve component.