So effective was the SPAD that several Allied countries used it during the War, including the United States, who had no combat airplanes of its own design in the War. Armed with one or two Vickers 7.65 mm machine guns firing through the propeller arc, the SPAD was a formidable foe. Some versions of the plane carried a devastating 37mm Hotchkiss cannon mounted in the nose and firing through the propeller hub. Other SPADs carried strut-mounted Le Prieur rockets.
This model of the SPAD XIII has markings used by one of the United States fighter groups based in France.