Authority conferred upon the heads of contracting activities (HCA) or the chief of the contracting office (CCO) under any paragraph of DLAD may be delegated with power of redelegation to other officials, except when specifically limited by law or the provisions of the pertinent DLAD paragraph. The chief of the contracting office will maintain a list of all delegations and promptly notify HQ, DLA, ATTN: J-71, of any changes. Commanders/Directors may serve as the Acting Supply Chain HCA when the Supply Chain HCA is unavailable. Deputy Commanders/Directors may also serve as the Acting Supply Chain HCA when the Commander/Director and Supply Chain HCA are both unavailable, by signing as “Acting Commander/Director”. Supply Chain HCAs exist in the Defense Supply Centers Columbus, Philadelphia, Richmond, and in the Defense Energy Support Center.