The reverse of this 1945 souvenir postcard from San Antonio's Arneson River Theatre bears a printed 'Keep 'Em Flying' emblem and the classic wartime admonition, 'The ENEMY is listening - Don't SAY it. The ENEMY can READ - Don't WRITE it.' San Antonio was a major hub of Army Air Forces training during World War II, and such security reminders appeared even on everyday tourist ephemera, reflecting the pervasive homefront culture of operational secrecy. Project: 218348