I have a lot of experience behind red dot sights and both eyes open shooting. Cheek weld allows for quick indexing allowing for repeatable performance. When I roll that weapon up from the ready position into the cheek the dot will be on whatever it is that I am looking at. No guess work.
I too am a combt vet who used a RDS then and now.
There are different styles of shooting that don't use cheek weld but they are alternatives dictated by environment. The first that comes to mind is SBU. It is used to get as low as possible or to use certain types of cover. SBU Prone is great.
I thank you for your service.