UNSC Navy working uniform

The UNSC Navy Working Uniform is the standard uniform worn by officers and ratings of the UNSC Navy for shipboard physical work and combat, as opposed to the dress and service uniforms. In this respect, they are much like the fatigues worn by UNSC Army and Marine Corps personnel.

Combat-ready uniform
The combat-ready uniform is worn by both commanding officers and junior crewmembers when battle is expected. It consists of a double-breasted olive drab tunic, bearing the seal of the UNSC Defense Force, with the wearer's surname printed above the seal. It is worn with matching trousers with cargo pockets, a belt-worn pistol holster, and a baseball-style cap, also bearing the UNSCDF seal. The combat-ready uniforms of ship commanders bear the ship emblem on the right shoulder. Medals and ribbons are not worn with this uniform.

Training uniform
A more austere version of the combat-ready uniform features the wearer's name on the left breast. Rank insignia are not displayed on the shoulders, and UNSCDF affiliation is also not displayed. A cap is not worn with this version. This is likely a training uniform, as its only known use was by Drill Instructors on Reach during SPARTAN-II training.

Coveralls
Simple service coveralls are the basic uniform worn by UNSC Navy personnel while on duty. Enlisted rank insignia is worn on the upper sleeve. Most working uniforms are comprised of a light gray shirt, matching trousers, and a belt; these uniforms also have darker sections that display the UNSC insignia and overall resemble the combat-ready uniform. The letters "UNSC" are displayed on the backpiece. Others are comprised of a single jumpsuit and are colored based on the wearer's technical specialty: Red, green, and blue are the most commonly used colors. With both versions, the wearer's name is displayed on the left breast.

Trivia
The color-coded working uniforms seen in Halo: Combat Evolved and Halo 3 are almost identical to those worn by BOBs in the Marathon trilogy. However, in Halo: Combat Evolved Anniversary, all Navy personnel aboard the wear gray two-piece uniforms which resemble those seen in Halo Wars, Halo: Reach, Halo Legends, and other more recent media.

List of appearances

 * Halo: Combat Evolved
 * Halo: The Flood
 * Halo: First Strike
 * Halo 2
 * Halo: Contact Harvest
 * Halo 3
 * Halo Wars
 * Halo Wars: Genesis