The Assistant Secretary of Defense for Sustainment (ASD(Sustainment)) serves as the principal staff assistant and advisor to the
Under Secretary of Defense for Acquisition & Sustainment (USD(A&S)), Deputy Secretary of Defense (DEPSECDEF), and Secretary of Defense (SECDEF) on logistics and materiel readiness in the Department of Defense (DoD) and is the principal logistics official within the senior management of the DoD.
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