The ammount of oil you report that it is using is not alarming and may be not worth freating over in the long run. I suggest you take a good look at all the air intake hoses and vacume lines to make sure everthing is in its proper place. Check the vacume hose that goes to the PCV valve to make sure it has not colasped or have a split in it. Another thing you could try if you find no problem with PCV system is have a top engine cleaning done at next oil change. This is done by injecting cleaner into the intake manifold while engine is running to remove carbon build up on piston rings and valves.
Its worth checking the things I mentioned but not worth going into the engine. You would better off trading it in if you go that far. Engine that uses a little oil will normaly last a long time. reading though the GM bulintins indicate you are not the first one with oil consumtion issues. Good luck to you. I see your a navy vet...thanks for your service!