United States diver badges

The various diver badges (also known as "diver insignia", "dive badges/insignia," and colloquially known as "dive bubbles") of the uniformed services of the United States are badges awarded to service personnel once they have graduated an appropriate diving course. The badges' origins lie in the cloth patch decoration worn by United States Navy divers on the upper-portion of the enlisted service uniform's left sleeve during the first part of World War II, when the rating insignia was worn on the right sleeve.

Source: Wikipedia — United States diver badges (CC BY-SA 4.0)