To me, it’s pretty obvious how corps should be pronounced. You wouldn’t go up to a Marine and say “So, how are things in the corpse?”. Not unless you wanted a deserved stern staredown, or worse.
The sad thing is, some YouTube comic channels don’t get this and call the Green Lantern Corps the Green Lantern Corpse. These are channels that call out others for getting things wrong, yet they mess up what is admittedly a pretty obvious pronunciation of a simple word and not just once in one video, but many times in many videos.