Galactic Marines wore special body armor with maroon or white[5] coloration — and a backplate. They were usually armed with DC-15A blaster rifles, but were also seen equipped with WESTAR-M5 blaster rifles. The Marines were distinguished by their unique visor gear: synthmesh designed to keep out various hazards such as snow, sand, airborne fungus, and ash.[6]
The Marines were cross-trained to fight on a variety of environments in ground and space, making them extremely versatile. They specialized in boarding and capturing enemy starships as well as planetary assault, and were deployed at many planets such as Rhen Var, Aargonar, Boz Pity, Mygeeto and Toola.[5] Bacara demanded the absolute best of his men, and would tolerate nothing less, unilaterally reassigning marines who did not meet his high standards, much to the dismay of General Ki-Adi-Mundi. The two maintained a respectful but contentious relationship, right up until the end of the war.[2]
The Marines training consists of three phases. Phase 1: conditioning, Phase 2: underwater and in-space ship boarding, and Phase 3: marksmanship. These training courses made the Marines the most elite fighting force of the Grand Army of the Republic.
At the Battle of New Bornalex, the Galactic Marines made use of prototype spacetrooper powersuits. Although the weapon systems on their new suits failed, the Marines continued to fight on. They engaged B2 super battle droids in hand-to-hand combat, using the enhanced strength granted to them by their powersuits. Their actions at New Bornalex earned the Marines a fierce reputation, making them one of the Republic's most feared clone military units.[2]
Commander Bacara (CC-1138) and a squad of Galactic Marines fought alongside Ki-Adi-Mundi during the Battle of Mygeeto. After receiving Order 66 from Supreme ChancellorPalpatine, Bacara and his squad turned on the Jedi and fired upon him. Although he was able to defend himself briefly, Ki-Adi-Mundi was overwhelmed by numerous blaster shots and killed.[1]
While deployed on Toola, the marines battledSeparatist Forces. When Order 66 was issued, they assisted CommanderKeller in tracking down fugitive Jedi heading for Ithaqua Station. The Jedi rode on STAPs to flee their pursuit, while Keller and his men used local beasts of burden as mounts to navigate the frozen plains to fulfill their mission.[5]
Galactic Marines still served the Galactic Empire as late as 1 ABY, but by then the armor was mostly worn for ceremonial use.[4]
In Star Wars: Battlefront II, clone troopers in Galactic Marine armor are known as "clone commanders," However, the Battlefront II clone pack by Hasbro identifies them as "Galactic Marines," so this might be a retcon. They also use chainguns in the game, however are normally seen in the films using DC-15A blaster rifles and DC-15S blasters. The armor also shares a resemblance to the later Galactic Empire's snowtrooper armor.
In the Star Wars Miniatures game, miniatures representing the military group are called Elite Clone Troopers. The second edition of the figure is called a Galactic Marine.
The Galactic Marines are essentially a Marine Corps, functioning both on land and in space.