(1) Payments of any grant or under any contract under section
242b,
242k, or
242l of this title may be made in advance or by way of reimbursement, and in such installments and on such conditions, as the Secretary deems necessary to carry out the purposes of such section.
(2) The amounts otherwise payable to any person under a grant or contract made under section
242b,
242k, or
242l of this title shall be reduced by
(A) amounts equal to the fair market value of any equipment or supplies furnished to such person by the Secretary for the purpose of carrying out the project with respect to which such grant or contract is made, and
(B) amounts equal to the pay, allowances, traveling expenses, and related personnel expenses attributable to the performance of services by an officer or employee of the Government in connection with such project, if such officer or employee was assigned or detailed by the Secretary to perform such services,
but only if such person requested the Secretary to furnish such equipment or supplies, or such services, as the case may be.