To the extent the Assistant Secretary determines a contribution to be appropriate, the Assistant Secretary shall require the recipient of any grant or contract under this subchapter to contribute money, facilities, or services for carrying out the project for which such grant or contract was made.
Payments under this subchapter pursuant to a grant or contract may be made (after necessary adjustment, in the case of grants, on account of previously made overpayments or underpayments) in advance or by way of reimbursement, and in such installments and on such conditions, as the Assistant Secretary may determine.