(a) The Assistant Secretary of State for Administration shall promptly inform the head of any agency whenever an employee (including a member of the Armed Forces) in that agency, or Family Member of such employee, is determined to be eligible for benefits under this subchapter.

(b) In accordance with inter-agency agreements between the Department of State and relevant agencies—

(1) The Veterans Administration will periodically bill the Department of State for expenses it pays for each eligible person under subpart D of this subchapter plus the administrative costs of carrying out its responsibilities under this part.

(2) The Department of State will, on a periodic basis, determine the cost for services and benefits it provides to all eligible persons under this subchapter and bill each agency for the costs attributable to Principals (and Family Members) in or acting on behalf of the agency plus a proportionate share of related administrative expenses.