His Majesty's Motor Torpedo
Boat (MTB) 781
commissioning at Grimsby
Commanding Officer Temporary
McKettrick, RNVR seated in the middle.
The other two officers are known by name, but not by face. It concerns Temporary Sub-Lieutenants D.W. Drummond and J.C. Rankin, both RNVR.
2nd row, standing 2nd from the right: AB Seaman C.J. Mercer.
Photo courtesy of Mr Danny Mercer.