24 U.S.C. § 14 : US Code - Section 14: Establishment of Navy hospitals

      The Secretary of the Navy shall procure at suitable places proper
    sites for Navy hospitals, and if the necessary buildings are not
    procured with the site, shall cause such to be erected, having due
    regard to economy, and giving preference to such plans as with most
    convenience and least cost will admit of subsequent additions, when
    the funds permit and circumstances require; and shall provide, at
    one of the establishments, a permanent asylum for disabled and
    decrepit Navy officers, seamen, and marines: Provided, That no
    sites shall be procured or hospital buildings erected or extensions
    to existing hospitals made unless authorized by Congress.