#70404, Vanessa Redgrave (holding the letter to the US Ambassador) and other leaders, anti-Vietnam war demonstration march from Trafalgar Sq to Grosvenor Sq Sunday 17th March 1968. I was told the headband was a Vietnamese sign of mourning for dead children. The Vietcong flag is held aloft. The Vietcong (National Liberation Army, NLF) was a political organisation and guerrilla army in South Vietnam which fought the Americans.