I used to wear worn out cammies when I used go duck hunting back when I was with Marine Reserve in the early 80's. Didn't feel any harm then or if you do it today. I didnt leave any rank on cammies. Actually had few compliments "nice camo" when I wore camo face paint when hunting tonawnda wildlife management area. I don't see any disrespect. After all, we earned the title "Marine"