First mention in his log book of 298 Sqdn appears to be July 1944 although it could be earlier. That means he probably wasn't involved in the Normandy landings and towing gliders, but was on flights for the SOE. That said 298 also supported later glider operations, possibly including
Operation Market Garden.
From July 1945 the Sqdn was moved to Raipur in India.
From the wedding photograph he's a sergeant, but it's impossible to make out the specialisation badge on his chest other than to rule out him as a pilot. The trades which used the wing badge included navigator, observer, radio operator, air gunner, and load master among several other less likely specialisations (see here:
https://www.rafweb.org/Ranks-Uniform/Badges3A.htm.
I agree with Michael J that the plane looks like a Halifax, but I have no idea which version. A crew of 6 looks generous for aircrew, but the group may include some ground crew.
Where is the photo of the log book page from? I assume you don't have the complete log book itself.