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(c) Supplies, materials and services needed in the construction 
      of military projects, tasks an similar capital works required 
      for the common war effort in the United Kingdom or in the British 
      colonial empire, except for the wages and salaries of United 
                         States citizens.                   
 
                                                            
 
 
(d) Supplies, materials and services needed in the construction 
      of such military projects, tasks, and capital works in territory 
      other than the United Kingdom or the British colonial empire 
      or territory of the United States to the extent that the United 
      Kingdom or the British colonial empire is a more practicable 
      source of supply than the United States or another of the United 
                             Nations.                       
 
      5. Requests by the United States Government for such aid will 
      be presented by duly authorized authorities of the United States 
      to official agencies of the United Kingdom which will b designated 
      or established in London and in the areas where the United States 
      forces are