The 5th Special Air Service (5th SAS) was an elite airborne unit during World War II. It consisted entirely of Belgian volunteers. It saw action as part of the SAS Brigade in Normandy, Northern France, Belgium, the Netherlands and (Germany). Initially trained in sabotage and intelligence gathering, they converted to motorized reconnaissance on armored jeeps. They were the first Allied unit to set foot onto Belgian soil and the first to cross the Siegfried line, albeit accidentally.