A review of the past week's television presented by Ludovic Kennedy , who discusses JOHN PILGER 'S documentary Heroes (ATV) about the plight of returning American Vietnam war veterans, The Play for Today: Psy Warriors (BBC1), and the film biography of the Israeli military leader and statesman Dayan (BBC2), with Roger Mills , who was recently given a BAFTA award for his work in documentaries, the military historian John Keegan , and Diane Harron who reported on the Israeli army in the BBC series Women at Arms.,