The purpose of this study was to complete a job analysis of the Air Force's Medical Service Career Field. This is the first in a series of reports designed to compare and make recommendations concerning the role of the Nurse and Medical Corpsman in the Air Force's health care delivery system. A sample of 1,996 airmen in the Medical Service Career Field was used for the analysis. The data were analyzed by use of the Comprehensive Occupational Data Analysis Programs (CODAP). Meaningful job types were identified, and recommendations for changing the structure of the Medical Service Career Ladder were made based on the occupational analysis. (Included are diagrams of major clusters and job types and two appendixes of statistics on task performance and task differences.) (Author/BP)