A job inventory covering four specialties in the Preventive Medicine Career Ladder, and consisting of 275 tasks grouped under 16 duty categories, was administered to 381 airmen in 14 major air commands. Incumbents of all skill levels completed a background information section and rated on a 7-point scale relative time spent on tasks. The airmen also indicated on a 7-point scale amount of work experience on each task compared with other tasks performed. Job descriptions are presented for 32 groups selected according to background information variables. Included are 8 specialty groups, 10 groups with differing lengths of military service, 6 groups with differing job interests, 2 groups differing in directed duty assignment, 2 groups defined according to assignment inside or outside CONUS, 2 groups having had specific technical courses, and 2 groups without these courses. Job descriptions are also presented for the Preventive Medicine Career Ladder total sample and for 17 significant job types identified by the automated job clustering program. A group overlap matrix shows the similarity of groups in terms of time spent on tasks. Summary tables indicate the percentage of members in each group who perform each task. Group difference descriptions are given for selected groups. Distributions of background variables for the total sample and for the 32 specialty groups are also shown. (Author) ; See also Volume 2, AD-671 107.