October 21, 2005—Upgrades to USAF’s Global Positioning System constellation make navigation a large category of space investment, which would peak in 2011 (top chart) and total $12.5 billion through 2024. The average age of GPS satellites should stabilize at six years around 2014, as seen in the bottom chart.
Source: Congressional Budget Office, The Long-Term Implications of Current Plans for Investment in Major Unclassified Military Space Programs, September 12, 2005.
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