Scoutmaster Merit Badge.
You help all of the boys with their advancement program including merit badges. You have definatley earned this merit badge if;
You have served as a leader of any Scouting unit; Pack, Troop, Team, Crew, Post or Ship. OR
You have served as an assistant unit leader in any of the above units.
Remember you can award this merit badge to someone you think qualifies as well as earning it yourself.