CO's a tough call - I've seen it go several ways, some honestly and some dishonestly - however, to some, I guess a person in America should not be allowed to change their mind if they have an honest life-changing turn of personal conscience over whether or not they can further justify an issue as morally contentious as war or the taking of life.
MOO - better he remained here than to deploy and then become a divisive detractor from his unit's focus while they are committed in-theater.
However, YMMV - and so it goes...
Richard's $.02