; (D) a joint venture, including a strategic alliance; (E) a trust; (F) a State, including a political subdivision or any other instrumentality of a State; (G) a Tribal government or consortium of Tribal governments; (H) any other governmental entity or public agency in the United States, including a special purpose district or public authority, including a port authority; or (I) a multi-State or multi-jurisdictional group of public entities. (3) Eligible investment The term eligible investment means an investment that facilitates the efforts of the Office— (A) to identify, accelerate, and sustain the establishment, research, development, construction, procurement, leasing, consolidation, alteration, improvement, or repair of tangible and intangible assets vital to national security; or (B) to protect vital tangible and intangible assets from theft, acquisition, and transfer by countries that are adversaries of the United States. (4) Investment-grade rating The Director shall establish a credit rating system to ensure a reasonable reassurance of repayment. This may include use of existing credit rating agencies where appropriate. (5) Obligor The term obligor means a party that is primarily liable for payment of the principal of or interest on a loan. (6) Rating agency The term rating agency means a credit rating agency registered with the Securities and Exchange Commission as a nationally recognized statistical rating organization (as that term is defined in section 3(a) of the Securities Exchange Act of 1934 ( 15 U.S.C. 78c(a) )). (7) Subsidy amount The term subsidy amount means the amount of budget authority sufficient to cover the estimated long-term cost to the Federal Government of a loan— (A) calculated on a net present value basis