Sorry it has taken a bit to reply.... my experience as an Army wife is being at the same station about 3 years - and a minimum of 3 years on an overseas tour with dependents (not a hardship tour like Korea, Johnson Island, etc....). When I was at USUHS some students were talking about a new program where doctors will be assigned to specific units - and if the unit deploys the doctor will go with them. So, it could be six months in Bosnia working with troops and displaced civilians. Or assisting with the Persian Gulf conflicts. It makes it difficult on a family, but it is like anything else - if you want it bad enough, you will make it work. And to make it work, one would assume that it takes a motivation much greater than graduating from medical school debt free. (Unless, I suppose, one believes that life is all about money.)
As stated above, talking with the health care recruiters is invaluable. Much of what they say can be applied to USUHS as well - except of course for the commitment, which is 7 years post-residency. The recruiter I met with to apply for HPSP was wonderful, and more than happy to discuss the program with my husband as well. (Note: the recruiters are 'competing' with USUHS to get the best students...a visit to USUHS is a good idea as well!)
Good luck,
Dena