aren't hospitals for people who are sick?
sick, as in, "these people are sick"
plus the relative isolation of being on a ship in the middle of the ocean under guard by all of the resources of the US Navy might have some tactical advantages.
This is a keen observation many anons overlook when accusing some people of being dirty. You never really know who is who in spy v. spy. That's the point after all.
To take it a step further, how do you know when an actor is only acting that he is not acting?