of modifying such loans, shall be as defined in section 502 of the Congressional Budget Act of 1974 ( 2 U.S.C. 661a ): Provided further, That amounts made available in this and prior Acts for the cost of guaranteed loans, as authorized by section 184 of the Housing and Community Development Act of 1992 ( 12 U.S.C. 1715z–13a ), that are unobligated, including recaptures and carryover, shall be available to subsidize total loan principal, any part of which is to be guaranteed, not to exceed $1,800,000,000, to remain available until September 30, 2025. NATIVE HAWAIIAN HOUSING BLOCK GRANT For the Native Hawaiian Housing Block Grant program, as authorized under title VIII of the Native American Housing Assistance and Self-Determination Act of 1996 ( 25 U.S.C. 4221 et seq. ), $22,300,000, to remain available until September 30, 2028: Provided, That notwithstanding section 812(b) of such Act, the Department of Hawaiian Home Lands may not invest grant amounts made available under this heading in investment securities and other obligations: Provided further, That amounts made available under this heading in this and prior fiscal years may be used to provide rental assistance to eligible Native Hawaiian families both on and off the Hawaiian Home Lands, notwithstanding any other provision of law: Provided further, That up to $1,000,000 of the amounts made available under this heading shall be for training and technical assistance related to amounts made available under this heading and other headings in this Act for the needs of Native Hawaiians and the Department of Hawaiian Home Lands. NATIVE HAWAIIAN HOUSING LOAN GUARANTEE FUND PROGRAM ACCOUNT New commitments to guarantee loans, as authorized by section 184A of the Housing and Community Development Act of 1992 ( 12 U.S.C. 1715z–13b ), any part of which is to be guaranteed, shall not exceed $21,000,000 in total loan principal, to remain available until September 30, 2025: Provided, That the Secretary may enter into commitments to guarantee loans used for refinancing.