It did not take the government long to realize that, if the cable and postal censorships were to be made sufficiently water-tight to prevent our military secrets leaking through to the enemy, it would be necessary to reinforce them with a censorship of photographs and motion-picture films. Accordingly, the Censorship Section of Military Intelligence was charged, in addition to its numerous other duties, with the censorship of all pictures taken by military photographers for the use of the Committee on Public Information and for other publicity purposes, as well as of those taken for commercial purposes by private concerns. In order to keep our own people, as well as those of the Allied and neutral countries, acquainted with the progress which the United States was making in the business of war, scores of cameramen belonging to the Photographic Section of the Signal Corps were sent out, at the request of the Committee on Public Information, to take pictures at the cantonments, training-camps, and munition factories in this country and in the theatres of operations overseas. As, however, there were countless details of our equipment, munitions, training methods, and the like of which the enemy must be kept in ignorance, it was imperative that all such pictures be carefully examined and passed upon before being released for publication or exhibition. And, moreover, they must be passed upon by men who were authorities on the various phases of the army with which the pictures dealt. That it was a matter which could not be left with safety to amateurs was emphasized by an incident which occurred in October, 1918, when the great Allied offensive was at its height. One Sunday morning the officers of the General Staff were astounded to see, in the illustrated supplement of a New York newspaper, detailed photographs of the new French howitzers, the very existence of which up to that time had been one of the most carefully guarded secrets of the Allies. The young officer who passed the pictures for publication explained that, not being an artilleryman, the howitzers looked like any other guns to him. A few weeks later the Staff was again surprised and angered to see another secret—the small tanks which were being manufactured in this country—revealed in the same paper. Here was another case of an officer having passed a photograph dealing with a subject of which he was ignorant. In order to prevent a repetition of such blunders, the Censorship Section arranged to work in close co-operation with the Chief Naval Censor and with experts in the offices of the Chief of Coast Artillery, the Chief of Field Artillery, the Chief of Ordnance, the Director of Military Aeronautics, the Bureau of Aircraft Production, the quartermaster-general and the surgeon-general, these experts being consulted in regard to all pictures relating to their respective arms of the service. With their assistance a series of precedents was