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United Kingdom shall have fully performed its duties and obligations 
      and discharged its liabilities hereunder. Any default by the 
      United Kingdom in the performance of any of its duties or obligations 
      or in the discharge of its liabilities hereunder shall entitle 
      the United States, by appropriate action to be determined by 
      the President, to enforce its rights, powers, claims and privileges 
      hereunder.
 
      
 
 
9. The President may exercise any power or authority conferred 
      on him hereunder through, such officer or agency as he shall 
      direct for that purpose. The terms "defense article" 
      and "defense information" as used in this Agreement 
      shall have the same meaning as defined in the Act.
 
      
 
 
10. Any Notice under the hand of the President or any officer 
      designated by him shall be deemed and taken as the notice of 
      the United States and the President shall be sufficient if delivered 
      at the British Embassy at Washington, D. C., or at the office 
      of the Permanent Secretary of the British Treasury in London; 
      and any notice by the United Kingdom shall be sufficient if delivered 
      to the American Embassy in London, or to the Secretary of the 
      Treasury of the United States in Washington, D. C. Any wavier 
      of any notice required hereunder shall not extend to or affect 
      any subsequent notice or waive any right of the parties to require 
      notice hereunder.