The United States Navy Medical Service Corps is a staff corps of the U.S. Navy, consisting of officers engaged in medical support duties. It includes healthcare scientists and researchers, comprising around 60% of its personnel, and healthcare administrators, comprising the remaining 40%. Many of the latter are former enlisted hospital corpsmen, the Medical Service Corps Inservice Procurement Program (MSC-IPP) being one of several routes from enlisted service to commissioned status. The Medical Service Corps has around 2,600 serving commissioned officers.