As I implied, WP seems like an awful place to the the GPA for med school and not a good place to get high MCAT scores or strong preparation for med school. The good part is you would have a clear back up plan.
In any case, without major hooks, you need to be a good candidate for a top 30 school to have a good chance at med school. However, it is probably better to go somewhere easier than that as they don’t adjust GPA much by school and major.
I am not a doctor and haven’t been in the military. I know a little about all of this, but others may know more. However, they are offering a lot with free tuition plus a stipend. Some med students take high interest private loans in addition to government loans. That money should all be tax free. I assume physicians make so much after completing their residencies that it might not be that great a deal.
In the Vietnam War, they let physicians complete some or all of their training before being drafted. Then the incentive was avoiding combat. However, it wasn’t like being a doctor in the Civil War not on the battlefield, and there were physician casualties.
I would think they would want many specialists in general surgery, in case they need doctors to treat wounded in war time. If they are looking for people in certain specialties, I would consider and/or find out what kind of work they have planned for those specialists. I wouldn’t do this unless you are willing to go wherever they send you, do whatever you are assigned, and possibly wind out in a war zone.