Public domain
Civilian protection. First Air treatment is the field to the victim of an emergency by members of a first aid group, in this case consisting of a doctor, denoted by the "M.D." and caduceus on the armband, and a nurse's aide
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineCivilian protection. First Air treatment is the field to the victim of an emergency by members of a first aid group, in this case consisting of a doctor, denoted by the "M.D." and caduceus on the armb. 1941-01-01. Hollem, Howard R., United States. Office For Emergency Management. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.