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Defense Secretary Pete Hegseth is undertaking a significant restructuring of the Pentagon even as the US remains engaged in active military operations abroad, according to BBC analysis. The scope of the changes, which touch on personnel, strategy, and institutional culture, could come to define a key part of President Trump's second-term legacy. Analysts and observers are weighing the potential costs of the upheaval, questioning whether the shake-up strengthens or destabilizes military readiness during a period of heightened global tension. The full implications of Hegseth's changes remain uncertain as they continue to unfold.