The legislation that created the U.S. Air Force , the National Security Act of 1947 , was signed by Truman while on board the VC - 54C .
After Roosevelt 's death in April 1945 , Vice President Harry S. Truman became president .
The legislation that created the U.S. Air Force , the National Security Act of 1947 , was signed by Vice President while on board the VC - 54C .
After Roosevelt 's death in April 1945 , Vice President Harry S. Truman became president .