sentences:  The film uses extensive cuts of archived footage shot during the war, but all of it is of the many varied aspects of mission preparation, takeoffs and landings.Except for the sequence under the opening credits, of bomber formations leaving voluminous contrails and then dropping bombs, no combat footage is used in the movie.Only two exteriors were used, of Brockhurst driving up to the main gate of the base in a jeep, and of Martin saying farewell to Dennis at his bomber's dispersal hardstand, totalling little more than a minute of film.