This is the sheet music for the song "My Son, Your Country Is Calling" by Milton Charles Bennett. It was published by Bennett in Hartford, Connecticut.
At the point of the article the United States had not entered into WWI, and those going volunteered for service in the event that the U.S. would enter the war. Both Dorothy and Cora Weir were trained at this encampment.
This is the poster for the song "Your King and Country Want You." This song was popular in music halls in Britain during World War 1. Women would sing it in order to get men to sign up for military service.