The authorities vested in the President by sections 7422 and 7430(a) of this title may not be delegated by the President pursuant to section 301 of title 3 or any other provision of law. The authority vested in the President by section 7424(c)(3) of this title may not be delegated by the President pursuant to section 301 of title 3 or any other provision of law to any official other than the Secretary of Defense, and if so delegated may not be subdelegated.