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different forms of illness and physical disability upon flying efficiency and to apply in practical form the results ascertained.  The essential object in view is to save life by insuring, so far as possible, that those who fly are physically and psychologically fit to do so.  The air service in India consists of eleven medical officers and twenty-one medical other ranks.  Amongst other things, they are required to attend ordinary cases of brief illness, known as "48-hour cases".  Otherwise, cases of actual illness or injury in the personnel of the air force are treated in the hospitals of the army.

15.  Co-operation between airplanes and ground troops is necessarily dependent upon the existence of rapid and reliable means of communication between the two.

16.  All airplanes carrying out artillery observation are equipped with radio.  The artillery unit, with which they are cooperating, has a receiving set manned by Royal Air Force personnel.  The answering communication, from the ground to the air, is effected in conventional patterns laid down in a fixed code.  Communications from the air with infantry and tanks is normally carried out by means of radio-telephony.

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