Determinations of legal eligibility and medical need for hospitalization of United States veterans for treatment rest exclusively with the United States Department of Veterans Affairs. Determinations as to various factors upon which eligibility may depend shall be made as follows:
(a)Determinations of service connection. For the purpose of meeting any requirement in 38 U.S.C. 1724 and 1732, and 38 CFR 17.36 through 17.37 for service-connected disability, the United States Department of Veterans Affairs shall determine that under laws it administers the disability in question was incurred in or aggravated by service, and
(b)Determinations of valid service. For the purpose of determining the necessary prerequisite service, determinations by the Department of Defense of the United States as to military service shall be accepted. In those cases in which the United States Department of Veterans Affairs shall have information which it deems reliable and in conflict with the information upon which the Department of Defense determination was made, the conflicting information shall be referred to the Department of Defense for reconsideration and redetermination. Such determinations and redeterminations as to military service shall be conclusive.