For educational purposesbr br Boeing continuing its legacy of mammutaciariy notable heavy bombers, developed the BN aircraft used for over 35 years by the Strategic Command This film traces that develolution showing B-45, B-48, XB-47, B-46. YB-60 and the jet-powered flying wing. br br The first flight of VB-52 through the various models to the shorter tail and turbo fan engine powered H, the last predoclos version. br br From bases in Guam, B-52s were used for tactical strikes in Vietnam and later from Thar land, cutting sortie time. Capable of tremendous destructive power, B-52s take part in Operation Linebacker. br br Raids into the north were not without losses as the Communists used every available SAM to prevent them Witness low level flight and the loss of most of the vertical fin and rudder of an H model on a research flight, the aircraft con-tinuing and landing safely. br br Front line service for over 30 years, still flying and one of the Great Planes.