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sector there were numerous losses in carrying out the work of corps observation.  There was a shortage of aerodromes, replacement of pilots and observers was slow, difficulty was experienced in procuring replacements of planes and of the small personnel were demanded two or three missions per team per day.  Pursuit protection failed at times to safeguard the success of missions when enemy pursuit machines dominated the air.
    The principal value of the work in all its operations from the Marne to the Vesle was in its results as an information agent, by the execution of visual and photographic reconnaissance, command missions, infantry contact patrols and surveillance of the enemy artillery and demonstrated the necessity of developing to the highest degree a system of liaison by radio between the various corps and divisional P.C.s and the Air Service headquarters.  The achievements in the adjustment of artillery by the Corps Air Service were of little value.  There was also developed the method of direct infantry contact patrols by flying so low that troops could be seen with the naked eye and the location of our troops could be furnished regularly and without interrupting the progress of the troops.