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When the air force as a Department of the army aircraft communications between ground units with air (Air to Ground Communication) is an aircraft-specific patrol, which is responsible for examining, shot fall. Flight control, as well as to the direction the wind is to communicate using light signals both the end and the unit that this mission was held only the flight unit, which is called the "alarm" best communications between ground units, it is still in a limited. Rely on the communication line (Land Line) of the Telegraph Department in those days.
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