I just got back from a workshop with fellow GS employees. One of the individuals there stated to me that he has a 50% Coast Guard service disability from Sleep Apnea. I was told that it equates to about $1000/month tax free not including an additional amount for dependents until they reach 18 yrs of age. I had to ask him how the Coast Guard service caused this disability. His answer was that it was "Anxiety". He also mentioned that he was going to be grandfathered in to keep his 50% +(dependents) since there will be a change in the Sleep Apnea % in 2016(I guess less of an amount since he was very happy). I don't know the 2016 changes but this was what I was told.