Captain Kangaroo is an American children’s television series that aired weekday mornings on the American television network CBS for 29 years, from 1955 to 1984, making it the longest-running nationally broadcast children’s television program of its day. Captain Kangaroo was Bob Keeshan who also played Clarabell the clown on the Howdy Doody show. Hugh Brannum was Mr. Green Jeans. Both Bob and Hugh served in the Marine Corps during WW2. rochestermilitary.com