The reverse of a 1945 souvenir 'Jumbo Post Card' from San Antonio, Texas, home to a dense network of Army Air Forces training fields including Kelly, Randolph, Brooks, and Duncan Fields. The card carries the era's iconic 'Keep 'Em Flying' emblem and a stark reminder of wartime operational security: 'The ENEMY is listening—Don't SAY it. The ENEMY can READ—Don't WRITE it.' Project: 218348