Retired Lt. Col. Charles W. Dryden, a Tuskegee Airman, signs a copy of his book, "A-Train," Feb. 25 for Master Sgt. Jonathan Curl and his sons Derreck and Xavier during a visit to Kadena Air Base, Japan. Sergeant Curl's grandfather was Colonel Dryden's crew chief during World War II. Since his retirement in 1962, Colonel Dryden has taken his message about America's changes through history to military members and civilians worldwide. (U.S. Air Force photo/Tech. Sgt. Rey Ramon)