The Comtesse de la Villestreux and the members of the Hottinguer family put the estate and private park in 21 rue Raynouard in Paris at the disposal of the American Ambulance Field Service (later known as the "American Field Service") for use as their headquarters in 1916.
Edward O. Bartlett, the inspector of equipment of cars at the AFS headquarters and former member of Section Sanitaire [États-] Unis (SSU) 4, is at the far left.