Those of the United States Armed Forces are worn mostly with utility uniforms and coveralls. They sometimes have a command logo on the front to denote command affiliation. Alternatively, the cap may have the wearer's rank on the front, if an officer. Baseball caps of a particular color are worn to denote a specific function of a person or particular job. For example, in the United States submarine force, red baseball caps are worn by drill monitors who facilitate and critique members of the boat's crew during drills. In the United States Army, parachute riggers wear red baseball caps and parachute instructors wear black baseball caps as part of their uniform. In various squadrons of the United States Air Force's civilian auxiliary, squadron-distinctive baseball caps have been issued as headgear (or "cover") for the Battle Dress Uniform, typically displaying squadron colors, squadron number, and/or squadron patch. Although the BDUs have their own cover, a patrol cap in M81 Woodland, some squadrons have opted for more distinctive covers.
