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The United States declares war on Germany
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General John J. Pershing arrives in England
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American combat forces arrive in France
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Steichen enters active duty as First Lieutenant in the Army Air Service
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Photographic Division officially formed
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Photographic Division officers meet to determine organization
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Major Barnes and Steichen sail for Brest
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Steichen's promotion to Captain announced
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Barnes and Stiechen arrive in Europe and establish offices in Paris, then Chaumont
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Steichen attends Rodin's funeral at Meudon
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Photo Division splits into the Signal Corps and the Photo Section
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Steichen spends 3 weeks studying British aerial photography in England
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Barnes and Stiechen visit French troops at the front above Chalons-sur-Marne, in late February
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Barnes officially recognized as Chief Photographic Officer
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Steichen assigned to the office of the Chief of Advance Station at Colomney-les-Belles
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Trained photographers and darkroom technicians arrive in mid-March
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Germany begins its Spring Offensive, its final offensive of the war
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Barnes moves to new Air Service Headquarters at Tours
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First Aero Observation Squadron completes preparation, first week of April
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Steichen appointed Officer-in-Charge of the Photographic Section, as Lt. Col. Leasure assumes a post with the General Staff
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Air Service reorganized with the Photographic, Balloon, Radio, and Information Setions under Colonel C. De F. Chandler
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Lt. Colonel Shelby C. Leasure appointed Officer-in-Charge of the Photographic Section
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US forces successfully carry out first independent American operation in the Battle of Cantigny
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Barnes reassigned to direct the Air Service's School of Aerial Photography in Rochester
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Steichen replaces Barnes as Deputy under Lieutenant Col. Leasure in Tours
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American forces stop the German attempt to cross the Marne River at Chateau Thierry
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Order issued to compile photographic histories of Air Service activity by Major General Mason Patrick, the Chief of the Air Service
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American First Army launches St. Mihiel offensive
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Allied forces begin attack at Meusse-Argonne, the final offensive of the war
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the Photographic Section is made a fully independent section
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Steichen's title becomes Chief, Photographic Section
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Armistice
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Steichen is sworn into the rank of Major
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Steicehn transferred back to Washington at the Photographic Section headquarters
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Steichen receives an Honorable Discharge, rank of Major