US weapons facing obsoletion, using outdated designs
With the US military dropping more bombs that its manufacturers can crank out, the risk is run that they might actually run out of the blasted things. Add to this the fact that many of the materials originate from a single producer or from a foreign supplier, particularly China.
Therefore, Washington finds itself in a tight spot as some of its components are even leaving the market, leaving America with fewer options to consider as it goes about the world bombing everything in sight.