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In selection the sole object is that all questionable material be kept out of the service. In maintenance the great object is that every aviator be kept in the service. When an airplane begins to show signs of trouble, it is taken off the field and put in condition. This is the only way to keep a plane in commission. When the flier shows the first signs of staleness, of nervous exhaustion, or of digestive disturbance he must be " overhauled " by a medical expert. That distinctly American product the Flight Surgeon bears the same relation to the flier that the mechanical expert bears to the airplane.
The examination according to amended blank 609, A. G. , was put into operation in May, 1917, and it is worthy of note that this same series of tests remains unaltered, even to the minutest detail, up to the service, officers present time. The judgment applied to the original selection of those to consti- Air Fighting Force of the United States was not based upon an attempt to decide whether or not the individual selected would be able to fly. It was known that men had been able to fly in spite of one or more physical handicaps, such as having only one leg, having one eye, having tuberculosis, or being cross-eyed, or having one collapsed lung, or being well over 50 years of age.
Laboratory tests determine definitely which individuals possess the ability to see well at night. " Stunting " is essentially an internal-ear problem. During and from his after rapid turnings the flier's brain is receiving impulses Nothing can control or alter the sending or receiving of these impulses. These impulses produce sensations of semicircular canals. Fliers vary greatly in their ability to interpret correctly the significance of these impulses. Experience alone enables the aviator to familiarize himself with the meaning of these impulses; motion.
Air Service Medical