All five of the US Armed Services have got resource sites about WW1, even the Air Force, which didn’t exist until 1947.

Be sure to check out the Army booklets, which are generously illustrated with Signal Corps art work and photographs.

US Army Center for Military History 

US Naval History and Heritage Command

US Marine Corps Museum

National Museum of the US Air Force

US Coast Guard Historian’s Office

James (“Jim”) Patton BS BA MPA is a retired state official living in Shawnee, Kansas and a frequent contributor to several WW1 e-publications, including "Roads to the Great War," "St. Mihiel Tripwire," "Over the Top" and "Medicine in the First World War." He has spent many hours walking the WW1 battlefields, and is also an authority on British regiments and a collector of their badges. An Army Engineer during the Vietnam War, he does work for the US World War 1 Centennial Commission and has memberships in the WW1 Historical Association, the Western Front Association, the Indian Military Historical Society and the Salonika Campaign Society.