A Churchill MkIV turret being converted to take the M3 75mm gun and mounting from a mine damaged Sherman tank. The converted tanks were known as Churchill NA75s
Link to a description of the modification process NA75 development
An SBD-3 Dauntless of Bombing Squadron 8 (VB-8) flies right over the head of the Landing Signal Officer during the recovery aboard USS Hornet (CV-8). No date given, but the sequence of pictures this is from indicates that this was in the spring of 1942 prior to Midway.
However please make a focus on these guys in the cockpit. Are they testing how many can sit there or trying to find out if a rubber cockpit for a Bf 109 would be needed?