One final lesson from GPS is that it does not matter if the US thinks it is fully sharing its space systems and capabilities. It only matters what the rest of the world perceives. Limited resources are going to be an issue for any country, especially in the high-cost business of space. If the US can persuade others they will reliably and responsibly provide certain space services; like navigation and SSA, others will spend their limited space resources in areas more beneficial to the US (e.g. international space station support). While the opportunity to prevent competitors to GPS is probably gone, the US can still use these key lessons to improve their SSA policy.

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Roberts, Tommy A. "Space Situation Awareness: How Much Should the US Share?." High Frontier Journal. (Winter 2005): 9-12. [ 8 quotes ] [ page 10 ]