Pic: Frank Pleszak
Of the 133 men who flew on the Dams Raid in May 1943, some 26 had previously flown in one of the RAF’s crack bomber squadrons, 50 Squadron based at RAF Skellingthorpe. Of these, Flt Lt Mick Martin DFC and his mainly Australian crew had finished a tour in October 1942, and had gone on to instructional duties. In February 1943 most of the rest were still based at Skellingthorpe, when the photograph seen above was taken. So this represents the largest single group of Dams Raid participants pictured together before the raid.
A recent post on a Friends of Skellingthorpe Facebook page led to the identification of a number of men in the group photograph. Thanks are due to the people who participated in this, and to Christina Spencer who originally posted the picture.
As of 7 October 2020, the following 16 men have been identified [Ranks and decorations as of 16 May 1943]:
Maudslay crew (AJ-Z on Dams Raid)
Sqn Ldr Henry Maudslay DFC (pilot)
Sgt Jack Marriott DFM (flight engineer)
Flg Off Robert Urquhart DFC (navigator)
Flg Off William Tytherleigh DFC (front gunner)
Knight crew (AJ-N)
Plt Off Les Knight (pilot)
Sgt Ray Grayston (flight engineer)
Flg Off Sydney Hobday (navigator)
Flt Sgt Robert Kellow (wireless operator)
Flg Off Edward Johnson (bomb aimer)
Sgt Fred Sutherland (front gunner)
Sgt Harry O’Brien (rear gunner)
Gibson crew (AJ-G)
Plt Off Harlo Taerum (navigator)
Flt Lt Richard Trevor-Roper DFM (rear gunner)
Hopgood crew (AJ-M)
Flg Off Kenneth Earnshaw (navigator)
Flt Sgt John Fraser (bomb aimer)
Shannon crew (AJ-L)
Sgt Brian Jagger (front gunner)
It is believed that the following were still at Skellingthorpe at the time, but they are yet to be identified in the picture:
Sgt Norman Burrows (rear gunner, AJ-Z)
Wrt Off Alden Cottam (wireless operator, AJ-Z)
Plt Off John Fuller (bomb aimer, AJ-Z)
Plt Off Frederick Spafford (bomb aimer, AJ-G)
Please get in touch if you can spot any of these.
[Thanks to Frank Pleszak, Shere Fraser McCarthy, Tamara Sutherland and Jim Heather for help with this.]
Dambusters Blog 
Is it possible to obtain a good jpeg of this Photograph as I would like to see if I can spot my Father Dennis James Oram on it. He flew with 50 Squadron prior to being moved to 617 in July 1944. During his time with 50 he won his DFC
you can see this picture enlarged on the friends of skellingthorpe web site with each man numbered.