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The following comments and suggestions are submitted covering JOINT ARMY AND NAVY IN COAST DEFENSE approved by the secre-taries (Secretaries) of War and Navy in 1920. 

PART 1 

JOINT ARMY AND NAVY ACTION IN COAST DEFENSE 

1. Paragraph 1. This statement of principles confines all direct methods of coast defense to operations within the coastwise sea lanes and does not take into consideration the fact that the Army, which is primarily responsible for coast defense, can, with its air force, attack enemy forces at distances beyond the limits of the coastwise sea lanes. This limit is not fixed, but depends upon the cruising radiues of the aircraft employed. 

The following is submitted as a substitution for paragraph 1: 

  1. Coast defense includes dispositions and operations having for their object: 

   (a) The repulse of a hostile attack upon any portion of the seacoast of the continental United States, the Panama Canal, or the insular possessions. 
  (b) The protection of naval vessels and merchant shipping from hostile attack in or off harbors or in coastwise sea lanes. 

  (c)The attack of enemy forces operating off the coasts of the continental United States, the Panama Canal, or the insular possessions, at any distance within the range of the Army Air Force. 

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