War and Conflict World War Two. Kingston, London. pic: June 1941. Children leaving school wearing their gas masks, prepared for every eventuality. [Getty Images]

War and Conflict, World War Two, Kingston, London, pic: June 1941, Children leaving school wearing their gas masks, prepared for every eventuality (Photo by Haynes Archive/Popperfoto via Getty Images/Getty Images)

Popperfoto Haynes Archive/Popperfoto