This was one of the very first lessons I was taught as a young Army officer, many year ago, and I’ve never forgotten it.
“No tired eyes in this unit, Lieutentant. If you see someone doing something wrong, correct them. If you see something out of place or improper, fix it or tell someone who can. If you see a piece of trash on the ground in the parking lot at the Commissary, pick it up and put it in the trash can.”
Over time I learned that it was the smallest things, the things that no one would ever know you did, that had the most impact when someone did see you doing it.