First Allied Airborne Army divisions were initially chosen to take part in Varsity: the British 6th Airborne Division, the US 13th Airborne Division and the US 17th Airborne Division, all of which were assigned to US XVIII Airborne Corps. One of these airborne formations, the British 6th Airborne Division, was a veteran division; it had taken part in Operation Overlord and the assault on Normandy. However, the 17th Airborne Division had only been activated in April 1943 and had arrived in Britain in August 1944, too late to participate in Operation Overlord. The division had also been absent from Operation Market-Garden, and the only
Operation Market Garden for air supply. Montgomery initially suggested "Operation Comet", a limited airborne "coup de main" operation that was to be launched on 2 September 1944. Comet envisioned using the British 1st Airborne Division, along with the Polish 1st Independent Parachute Brigade, to secure several bridges over the Rhine River to aid the Allied advance into the North German Plain. The Divisional Headquarters for the British 1st Airborne Division, with the 1st Airlanding Brigade and the Polish 1st Independent Parachute Brigade were to land at Nijmegen, the British 1st Parachute Brigade was to land at Arnhem, and the British 4th Parachute Brigade