The terms, Combat, Combat Star, Select and Select Star were classification levels of V force aircrews. They were, in some cases, rewarded with a superior name tag. There was a scheme where they would get a higher priority for 'Lone Rangers' overseas.
A lot depended on the crew. You could have a Combat Star captain, a Select NavRad, a Select Star NavPlotter so the crew would be rated as a Combat Star crew. The co-pilot and AEO didn't count, as usual.
Tanker crews could only get up to Select standard, but that didn't matter as they were punching across the Channel quite regularly. Your Main Force crews would flog their guts out to get up to Select or Select Star standard and be rewarded with two Lone Rangers to Malta, in a tour, instead of one.
I may have been a Select co-pilot on a Combat crew but don't worry about it.