Sorry to hear.
I hope he gets the support he needs- I saw a Chaplain have a complete nervous breakdown after a deployment a while back. The Chaplains and assistants have a rough job.
Here's my cynical view on what you've presented-
Most workers are looking to get the job done with the littlest amount of effort possible. In this case, the "job" being take care of your husband.
Chapter for PTSD will require lots of testing, counseling, paperwork. It would give your husband disability and likely other benefits. My Guess is that the 5-17 would be Easier for them
but not provide as much support for him.
I would start off first of all refusing those waivers. The rules are there for a reason, which apparently these leaders aren't thinking about.
Ya'll could call Army one source, there are lots of other resources (finally!) for Soldiers suffering stress from deployment. See the healthclinic, hospital, wherever if he still needs help.
DON'T take the easy path out. He's got the rest of his life in front of him, the yahoos who say it will be "easier to do X" likely will just move on to the next thing. Your husband's future isn't as important to them as it is to you or him. So hang in there!
Be Proud of what you do- and do it Well! ~me