My 2 cents.
Reasons not to deploy, well if its warranted such as 'ill health of a family member', or something similar on compassionate reasons, yes, but its when you got through the hoops, and then wimp out for some other limp dicked reason, sure don't send them, but they knew the risks, on joining, and the work-up trg for the mission, and the admin/trg time to get them where they are prior to going over.
Punt!
My view is you want personnel there who want to be there, and be there for the group as a whole, if not - piss off. They become a liablility instantly, and a morale problem for the rest of us.
I was injured on my tour, kept my mouth shut until not long before we left, and I was asked if I wanted to return early. No way. We left as a group, and I WILL be returning with the same group. There was no way I was going home early!
We did send men home, but for what anyone of us would consider genuine compassionate reasons. No one went home for any other reason. Some even broke into tears upon their farewell, because theyt did not want to leave their mates!
Thats dedication and loyality.
Again my 2 cents.
Wes