The SAS, the world's most famous special operations unit, made its name in the desert of North Africa, shooting up Axis airfields from specially modified Willys jeeps. Following the start of the El Alamein offensive in October 1942, the SAS used jeeps effectively in reconnoitring and ambushing the retreating Afrika Korps. After the conclusion of the North African campaign, the Willys underwent several small but significant changes, including the introduction of the .303 Browning machine gun.