I couldn’t pick out why the Shooter left the Navy at 16 years. Did he fail promotion several times? It’s hard for to me to imagine why a service member would leave just one reenlistment short of 20 years and retirement. I don’t want to sound unsympathetic but he knew the routine. I think it’s neat that he shot Bin Laden but so what? A lot of us have killed people for our country and then we carried on with our careers and then on to our next challenges. He needs to do the same as the rest of us.
It's hard for me to imagine also. Later in the article it's alluded to that he left because he was enjoying killing a bit too much and/or he didn't want to go through all this only to be killed now. But it wasn't very clear and is a little hard to understand.