This primary source comes from the Records of the Office of the Chief Signal Officer.
National Archives Identifier:
530724Full Citation: Marine receiving first aid before being sent to hospital in rear of trenches. Toulon Sector, France; 3/22/1918; Records of the Office of the Chief Signal Officer, Record Group 111. [Online Version, https://docsteach.org/documents/document/marine-receiving-first-aid-before-being-sent-to-hospital-in-rear-of-trenches-toulon-sector-france, May 15, 2024]