Honestly I think the hospital is a clinic like you said. The White House already has some good medical equipment but it would be better in a clinic environment with maybe a couple of flight surgeons on staff. I could see that being mostly for the POTUS, but also for the families and WH staff if they get sick/injured at work. I assume it will have certain specialized capabilities that a normal flight surgeon's office or a small clinic would not - maybe even a small OR for emergencies. Probably trauma equipment, x-rays, a lab for quick results - not stuff like an MRI/CT Scanner. I just don't think there will be major chemical/biological/drug research done there for fear of a stupid fire or accident somehow affecting WH personnel.