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(or 6,000 feet). Close formation in "V" is necessary for this purpose. To develop sufficient fire from the firing unit, which in this case must be the squadron, about eighteen ships are necessary. This requires a squadron organization of about twenty-five ships. With a ship the size of our bomber of the Martin Type, or the British Vickers-Vimy,or the French Farman, this is entirely practicable. With the larger ships on the order of the Barling bomber being constructed by us or the giant German Junker or the super-bomber of the British, it may be necessary to reduce these numbers on account of the size of the equipment, and the number of men required to keep it up. For the present, however, for our own use, I believe in the twenty-five ship bombardment squadron and four squadrons in the group. 

As to attack aviation, there are two problems involved -- one, that of diving attack, and the other, that of horizontal attack, - in other words, where the airplane flies along on an axis parallel to the ground. So far the two have not been combined in one airplane, although it is possible that this may be done. The armor required should be sufficient to hold off the fire of the .30 caliber infantry rifle or machine gun. These airplanes must be capable of attacking at night as well as in the day because hereafter the movement of troops will be made 

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