Photo curtesy of the U.S. National Archives
On March 22nd instructions were received from the Troop Carrier Wings to each Troop Carrier Group to paint an assigned marking, unique to each Group, on the top of all the gliders for identification purposes.

National Archives/NWWIIGPA Collection
Back caption: Troops of the 17th Air-borne Division, load aboard gliders before the take-off on the air-borne mission of the Rhine River. Germany 3/24/45

Thomas Pleger Collection/by daughter Marian Klieber
Back caption: Mar 24, 1945 - Pre Take off for Wesel Hop. 437th Troop Carrier Group. Base: Coulemere, France (near Paris) Personnel: Members 17th Air Borne Glider Inf. --Extra

National Archives/NWWIIGPA Collection
Back caption: 1st ALLIED AIRBORNE ARMY ETO HQ 45 24 MAR 22865-4 CREDIT ... U.S. ARMY SIGNAL CORPS PHOTOGRAPHER T/4 CLYDE M. PLETCHER
A Double tow glider formation, one of the new techniques used for the first time in an airborne operation, is seen over drop area in vicinity of Wesel, Germany, during the 1st Allied Airborne Army's air invasion of Germany. Photograph was taken from a glider of the 439th Troop Carrier Group whose load was the 507th PARA-Infantry Regiment, 17th Airborne Division, 1st Allied Airborne Army.” [The 507th PIR was transported by the 439th Troop Carrier Group in Serial A-15. These consisted of glider chalk number 105 thru 125.