James Montgomery Flagg Navy! Uncle Sam is calling YOU! Enlist in the Navy DO IT NOW! c.1917. Uncle Sam jabs his finger demanding attention and compliance. The need for our navy was never greater. It was imperative to transport 2,000,000 fighting men and mountains of supplies “over there.” The navy did so without the loss of one transport vessel to enemy action so effective was their armed convoy system. 16×13 near mint, conservation backed.