On Debbie Argel’s first motorcycle trip from California to Wisconsin in 2003, she was nervous about the risks, but encouraged by her son, Air Force Capt. Derek Argel. He told her: "Fear of death is really just a fear of life. Go for it, Mom." Two years later, on Memorial Day, 2005, Derek was killed in Iraq. In his memory, and to raise money for children of special military forces killed in the line of duty, Debbie and her husband, Todd Bastian, are riding their cycles from Lompoc, Calif., to Milwaukee for Harley-Davidson Inc.'s 105th Anniversary Celebration. The big party...