Aviation training in 1917 involved deciphering cryptic messages to determine the location of enemy batteries in the battle sector. The speed and accuracy at which candidates deciphered the messages determined their fitness for the job. The map in the photo represents a crew's firing elevation of 600⁰ in a laboratory setting. This photograph, labeled as 111-SC-447, was released to the C. P. I. and subject to approval from the Seg. Corps on December 27, 1917.

GLIX-115-2RC0M43

Aviation training in 1917 involved deciphering cryptic messages to determine the location of enemy batteries in the battle sector. The speed and accuracy at which candidates deciphered the messages determined their fitness for the job. The map in the photo represents a crew's firing elevation of 600⁰ in a laboratory setting. This photograph, labeled as 111-SC-447, was released to the C. P. I. and subject to approval from the Seg. Corps on December 27, 1917.
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Aviation training in 1917 involved deciphering cryptic messages to determine the location of enemy batteries in the battle sector. The speed and accuracy at which candidates deciphered the messages determined their fitness for the job. The map in the photo represents a crew's firing elevation of 600⁰ in a laboratory setting. This photograph, labeled as 111-SC-447, was released to the C. P. I. and subject to approval from the Seg. Corps on December 27, 1917.

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