Agree totally. Why mark up a body even whose skin is fearfully and wonderfully made and glorifies its Maker, and that my soul knoweth right well.
Putting a tattoo on it would be like painting a mustache on the Mona Lisa, thinking, "I'll improve it, just a little -- add a little personal touch."
Permanently marking your body is like having a nice white shirt with a big ink stain on the pocket. Is that an ... improvement? something to be admired? to show off? to be ... special?
The only mark of military service that I revere is a wounded body, mind, or heart.