This censored envelope was mailed home by Pvt. Willie W. Wagener, a soldier serving with Company B, 1st Gas Regiment, American Expeditionary Forces, during World War I. Addressed to his mother in Ceres, California, the envelope bears the U.S. Army Postal Service cancellation and a 'Passed as Censored' stamp, both standard features of wartime correspondence subject to military review. The 1st Gas Regiment specialized in chemical warfare operations, one of the more hazardous and specialized roles on the Western Front. Project: 218262