Carl is a replacement for Gomer, who is a replacement for Sad Sack. . I thought the Greeks in their cute white tutus, clown shoes, and red hats were quite funny.
Think of Carl as a Millennial new enlisted grunt trying to do an everyday task with less than expected results.
Armys world wide and in history have had their Carls...King Harold fought against William the Conquerer with a house of Carls...or were they House Carls? Its easy to take cheap shots at Millenials, but each generation doesn't have the monopoly on sad sacks and Carls.