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1. Very pistol and grenades from plane to ground.
2. Rifle discharge and rockets from front line to rear.
a. Rocket positions should be reported by observer. 

3. Flares from ground to plane for marking positions.
a. Vari-colored flares and rockets may be used to convey certain signals and meanings to observer. 

 c. Projectors.
1. Barely ever used except to attract observers' attention but could be used to transmit messages.

6. Ground Communications.
(a) Couriers.
1. Ground
2. Aerial
a. Ground couriers consist of:
Motor vehicles
Bicycles
Mounted
Runners

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