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4.

cerned [[concerned]], that would be used for heavy bombardment. 
This is the attack plane. The vulnerable parts and the personnel are protected by light armor. It carries a heavy battery of machine guns and 200 pounds of small fragmentation bombs. Its principal use is for attack against ground troops, convoys, trains, and anything that provides a suitable target for attack with machine guns and light bombs in force. 
This is the ROMA, illustrating an airship of the semi-rigid type. I will go into the details of its use later. 
The work of the Air Service in war falls into two distinct classes: the air service proper and the air forces. This distinction should be clearly noted, as I believe that the confusion that now exists in the minds of the officers of the services in regard to the employment of an air force as distinct from the air service is due to the lack of conception of the difference between the air service and the air force. 
Observation aircraft, with which probably you are most familiar, constitutes the air service proper. In the restricted meaning of the word, the air service, that is corps and divisional observation, is an auxiliary to the line. They are combat troops in that they may be called on to fight in the performance of their missions. But combat, offensive action, is not their role. It figures in their scheme of things as a necessary evil. They are, in fact, a service, and all the general rules that apply to the