The Secretary may reduce a grant by the amount of the fair market value of any supplies (including vaccines and other preventive agents) or equipment furnished a grant recipient when furnished at the request of the recipient. The Secretary also may reduce a grant by the amount of the pay, allowances, travel expenses, and any other costs in connection with the detail of any officer or employee of the Government to the recipient when the detail is at the request of the recipient. The amount the grant is reduced shall be available for payment by the Secretary of the costs incurred in furnishing the supplies or equipment or in detailing personnel and shall be deemed to have been paid to the recipient.