The Navy, Marine Corps, and Coast Guard require collar grade insignia to be worn by commissioned officers in the O-3 pay grade (designated as Lieutenants in the Navy and Coast Guard, Captains in the Marine Corps) on selected dress and utility uniforms. It consists of two silver bars connected at both ends by a holding bar. In addition to serving as collar devices, these insignia are also used rank insignia on Garrison Caps (all three services) and Ball Caps (Navy and Coast Guard).
Prior to 2006, Navy Lieutenants wore collar insignia with variety of shirts and uniforms, but that number was reduced to just one—the Service Khaki—with the discontinuation of several working uniforms. Lieutenants serving as Line Officers wear the rank insignia on both collar points of the short-sleeve khaki shirt, while those who are Staff Officers wear the collar grade insignia on the right collar point and a Corps device on the left collar point.
Coast Guard Lieutenants wear collar grade insignia on the light blue shirt of the Service Dress Blue uniform if they have approval to remove the Service Dress Jacket (for work in an office environment), but it is a required component of the Winter Dress Blue uniform and the Dress and Ceremonial Uniforms worn by the Coast Guard Band.
Captains in the Marine Corps wear collar grade insignia on both collar points of the khaki shirt (even if the shirt is worn under the service or dress sweater) and on the utility and camouflage maternity coats. Collar grade insignia are required when Officers of any rank are wearing the Service “A” uniform.