The description says "Served as a pro-tem moderator for at least 1 year or through site graduation". I do not know what the phrase "pro-tem" means. In what situation would this even occur? Does it warrant a badge? I feel that it is akin to Area 51. It wouldn't occur nearly enough to warrant having a badge.
Also: The Sheriff badge description ends with a period. No other description has ending punctuation. The badge-earners page has two periods now. http://stackoverflow.com/help/badges/3109/sheriff
at least 1 year..