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5. 

other and more obvious auxiliaries in their relationship to the line, apply also to Observation aviation. 
The remaining branches of aviation, which we have designated the air force, that is combat aviation, constitute a true arm. Bombardment and Attack aviation have for their aim the destruction of personnel and material on the ground. Pursuit aviation exists for the destruction of hostile aircraft. 
In the same broad sense that the navy assists the Infantry, so also does the air force. But in deriving the doctrine that must underlie all principles of employment of the air force, we must not be guided by conditions surrounding the use of ground troops, but must seek our doctrine, as does the navy, in the element in which it operates. 
In order to understand clearly the tactical employment of aviation, it is necessary to take up in detail the employment of each of its branches. That most closely allied with the remaining arms of the service is Observation, or the Air Service proper, and will be dealt with first. 
The search for information of the enemy is a thing as old as war itself. But the technique of this service has undergone very wide variations in different ages, with which you are all familiar, until, in the World War, the airplane observer became the most important source of information in battle. As a consequence, observation was the first use to which the airplane was put. In course of