TRICARE Operations Manual 6010.59-M, April 1, 2015 Administration Chapter 1 Section 1 Organization Of The Defense Health Agency (DHA) Revision: C-2, May 17, 2017 Chapter 55, Title 10, of the United States Code (USC), provides that the Secretary of Defense and the Secretary of Health and Human Services (HHS) shall jointly prescribe regulations for the administration of TRICARE. Department of Defense Directive (DoDD) 5136.13 (The DHA Charter) established DHA as an agency under the policy guidance and direction of the Assistant Secretary of Defense (Health Affairs) (ASD(HA)). - END -