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7.
up its work at the point where the balloon ceases to function.
Observation at night can be carried out by divisional and corps squadrons, but as the principal areas to be covered are those well in rear of the enemy's lines, this duty is usually performed by any observation and night bombardment. 
Under general condition the divisional squadron works, in its [[seetor?]], about five miles to the front, the corps squadrons about ten miles, and the army observations to sufficient depth to cover the enemy rear areas. By this process of overlapping every area necessary is covered.
Observation, or air service, is an auxiliary to the fleet in the same manner as to the army. In its operations at sea the fleet is concerned with observation, the conduct of fire, and is dependent on combat aviation only to the extent of providing protection for its observation. In other words, the navy should be limited to its auxiliary aviation, observation and the necessary combat aviation to protect it. Only planes to operate with the fleet should be provided. 
In coast defense, we may use airships and airplanes. Under ordinary conditions the airship would be used to locate the hostile fleet at distances of from 100 to 200 miles off the coast, but after obtaining contact they would be withdrawn and replaced by airplanes, as, due to their vulnerability they would be at the mercy of hostile pursuit.