Well, you know it used to be called "shell shock" and the treatment for it was to redeploy. Now they know that being with their unit gives them psychological support, and removes their feelings of being inferior and abandoning the troops. I don't know that I agree with all that... but I do know that one reason they are being redeployed is that we no longer have a draft in this country, and we just don't have enough soldiers and sailors to protect us and the whole world.
This is not meant as a political statement, just stating some facts as to why .