During my collecting I stumbled across these two insignia. It was not until I read a book about Herbert Hoovers relief efforts that I learned who the Polish Grey Samaritans were. I later learned of the 1919-1921 Polish-American Typhus Relief Expedition. The first time the US Army mounted a humanitarian relief effort. They were to create the "cordon sanitare" sometimes thought to be Poland's effort to prevent the red peril of the Bolsheviks. Norman Davies covers this very well in White Eagle, Red Starr the Polish Bolshevik War 1919-1921. As does Janus Cisek in his book, Kosciuszko We Are Here, the story of the American volunteers pilots during the Bolshevik War. Stanford University has all of Herbert Hoovers papers along with an enormous wartime poster collection. It includes all sorts of information on Meriam Cooper and the 7 Eskadra. Professor Alfred Cornbise wrote an excellent book on the American Typhus Relief Expedition. It is a very interesting period of Poland's post WWI history. I shall share more from collection after I take some better photographs.