WW2 US Army American Military Infantry Overseas Garrison Side Cap - Enlisted Man (S) American Infantry Garrison Cap with blue piping. These are great reproductions of the overseas cap worn by the enlisted men of the US Army during WW2, with the blue piping indicated Infantry status. The hats found their origins in WW1, with this style adopted throughout WW2. Great reproductions of the iconic US Garrison Cap, with the blue piping of the American Infantry.