((a)) ** .—**
((1)) Except as otherwise provided in this chapter, the Secretary of Defense shall administer this chapter for the armed forces under his jurisdiction, the Secretary of Homeland Security shall administer this chapter for the Coast Guard when the Coast Guard is not operating as a service in the Navy, and the Secretary of Health and Human Services shall administer this chapter for the National Oceanic and Atmospheric Administration and the Public Health Service. This chapter shall be administered consistent with the Assisted Suicide Funding Restriction Act of 1997 ( et seq.).
((2)) Except as otherwise provided in this chapter, the Secretary of Defense shall have responsibility for administering the TRICARE program and making any decision affecting such program.
((b)) ** .—** The Secretary of Defense shall, to the maximum extent practicable, provide a stable program of benefits under this chapter throughout each fiscal year. To achieve the stability in the case of managed care support contracts entered into under this chapter, the contracts shall be administered so as to implement all changes in benefits and administration on a quarterly basis. However, the Secretary of Defense may implement any such change prior to the next fiscal quarter if the Secretary determines that the change would significantly improve the provision of care to eligible beneficiaries under this chapter.