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Hagel was assisted by the Secretary of the Army John M. McHugh, Army Chief of Staff General Ray Odierno and the Sergeant Major of the Army, Raymond F. Chandler.
As Sergeant Major of the Army, Chandler serves as the Chief of Staff of the United States Army's personal adviser on all enlisted-related matters, particularly in areas affecting soldier training and quality of life, including the adoption of the new Army Service Uniform, which phases out the Green Service Uniform in 2014.