Non-available time (NAT) is defined as that time military personnel are diverted from their occupational duties. NAT is an important parameter of the military manpower requirement determination process, yet the services define and measure NAT differently. Although the Air Force has the most detailed approach along with the most current data base for estimating NAT, the Air Force methodology may not be the most appropriate for DOD-wide application. The Office of the Assistant Secretary of Defense (Manpower, Reserve Affairs and Logistics) must resolve certain issues before defining a NAT policy. A Task Force is recommended to coordinate DOD-wide actions.