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U.S. Army Secretary Dan Driscoll in Washington, D.C., last year. Photo: Tom Williams/CQ-Roll Call, Inc via Getty Images

U.S. Army Secretary Dan Driscoll is stepping down from his post, according to a Department of Defense official.

Why it matters: Driscoll, the youngest Army secretary in U.S. history, was well-liked in the military and regarded as a Trump 2.0 power player who took on a diplomatic role in talks to end the war between Russia and Ukraine.