It appears to be a U.S. Air Force regulation regarding the physical examination of Air Force personnel to be discharged or re-assigned. (i.e.: AFI stands for Air Force Instruction) The numbers give the regulation number and location within the regulation that the specifc subject matter can be found.
AFI 36-2902 is the Air Force Instruction that covers "Physical Fitness and Body Composition Program." It provides guidelines and regulations for managing the physical fitness requirements of Air Force personnel, including standards for testing, exemptions, and remedial training. Compliance with this instruction is important for maintaining the health and readiness of Air Force members.