For several years, Pentagon leaders have raised alarm over the erosion of America's military lead on many fronts. As the US fought fairly low-tech counterinsur-gencies in Afghanistan and Iraq, competitors like China, Russia, and Iran studied the capabilities that made the US dominant in the 1991 Gulf War and later in the Balkans, looking for ways to blunt American military advantages and build matching capabilities. Those advanced adversary systems are now being fielded.
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