Rate to be fixed promptly upon the happening of the event causing the American Institute Hull War Risks and Strikes Clauses dated December 1, 1977 (including Automatic Termination and Cancellation Provisions) for attachment to American Institute Hull Clauses dated June 2, 1977 of any war risk policies to become operative and premium shall be payable within ten (10) days after receipt of notice of the amount thereof by the assured. Premiums shall be paid to the Underwriting Agent that issued the binders by check payable to the order of “Maritime Administration, Department of Transportation.” In the event that it is subsequently determined that insurance under interim binders did not attach, premiums paid will be refunded by the Maritime Administrator.