Leon Helguera designed this poster for the Office of War Information’s Security of War Information campaign urging the public not to reveal military information that might assist the enemy. It was ultimately one of the campaign’s most successful images and the motif of Uncle Sam with his finger to his lips was everywhere in 1943 and 1944 (even on the back of Schraffts menus in New York City). In a letter of July 1944, Emmette V. Graham, the chairman of the Security of War Information Committee, wrote to Helguera, telling him that “a year ago the Security of War Information Committee distributed well over a million copies of the Security poster you did for us of Uncle Sam with his finger to his lips. It was not only distributed in poster form, but was also made into stickers for taxis, buses, street cars and trains…your Uncle Sam has been used constantly during the past year as the “trade mark” of our campaign.”