WW2 Head Wardens and American Ambulance Great Britain driver

A most interesting photo that is captioned "Civil Defence wardens and a member of the American Ambulance Great Britain search amongst rubble for salvageable items following a V1 Flying Bomb strike in Upper Norwood, south London during 1944.” In the centre a head warden looks through the debris of a building whilst another head warden with white helmet (and probable single black band) looks on. Behind them is a member of the American Ambulance Great Britain who wore a distinct uniform that was similar to First Aid Nursing Yeomanry (FANY) but with distinctive sleeve badge featuring the cross flags of Britain and the US.

WW2 Head Wardens and American Ambulance Great Britain driver