Charles R

I've filed a VA disability claim for COPD. I use oxygen while sleeping at night and upon exertion in the day time. I was in Desert Storm/Shield with the burn pits and the oil well fires in Iraq and Kuwait. My FEV is 46%. In a sleep study, my SO2 was measured below 88% for 305 minutes in a 310 minute test. What rating will I get from the VA?