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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. Page 15
Source: TACTech, 1997. were discontinued almost doubled, from 7.5 percent of the total to 13.5 percent of the total. There is every reason to believe that these percentages will increase in the future. Although the total number of unique part styles is decreasing as levels of circuit integration increase, the percentage of discontinued parts is not expected to decrease at the same rate. A significant portion of funds allocated to each weapon system is being used to contend with the DMS/ OP problem. Estimates of the cumulative amount of money required to address DMS/OP for the F-15, F-22, and U-2 (including development, production, and installation) are close to $1 billion each (U.S. Air Force, 2000a). It is important to stress that these funds are required simply to maintain current functions and do not buy any additional capability. RISING SUPPORT COSTSA DoD report, Product Support for the 21st Century: A Year Later (September 2000) notes that DoD spends about $62 billion annually to support and maintain its equipment (DUSD[AT&L], 2000). In fiscal year 1999 (FY99), the Air Force spent about $3 billion for depot-level repairs of its aircraft. Approximately one-third of this, or $1 billion, was spent on maintaining and supporting avionics systems (operations and maintenance [O&M] funds), as shown in Figure 2-1 . An additional 
~ enlarge ~ FIGURE 2-1 Cost of avionics in depot-level aircraft maintenance for FY99. Source: U.S. Air Force, 2000a.
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