I drafted deck plans and a crew roster for a small 100-man Patrol Cutter (actually, the Fed POL from SFB). The medical staff typically consists of one Doctor, one RN nurse or PA physician's assistant (either is "almost" a doctor in their own right), two enlisted corpsmen / combat medics, and one or two med-lab technicians, plus anyone who has Basic Emergency First Aid training. It's not uncommon to have a second Nurse or an Intern (doctor-in-training) assigned.
In context, that sort of makes sense, but doesn't alter the fact that that's a bigger medical department than anything smaller than an amphibous assault ship or helicopter carrier in the RW, which was the point that I was making.
For instance, the roughly half-manned decommissioning crew for USS Ticonderoga (CG-47) was about 170 personnel (The CO, XO, 27 officers (inc 1 CWO), 27 Chiefs and over a hundred petty officers and enlisted), and the only corpsmen onboard were a HM1 and an HM3. Based on a recent (2017) tour by the Vella Gulf then the standard complement would be perhaps a Chief and a 2 petty officers (both HM3 in this case, but presumably somewhat variable).