Sometime prior to the Battle of Mon Cala, it was gradually replaced by Phase II clone trooper armor, which was more comfortable and capable of supporting more specialized equipment. Fett himself gave input on the armor, and it was introduced at the same time as the first batch of clone troopers, which were deployed at the First Battle of Geonosis. The armorsmiths of Kamino designed Phase I armor after the Mandalorian armor worn by the clone soldiers' template, the bounty hunter Jango Fett.

Wearing Phase I armor, clone troopers fought in the Clone Wars on behalf of the Galactic Republic. A clone could also have attachments to their helmets, such as macrobinoculars, a rangefinder, or a visor.

The helmet also contained a comlink, and a comlink antenna was located in the helmet's crest. Inside the Phase I helmet, a clone trooper had a life support system, a tracking device for monitoring troop movements, and a display screen, which was built into the helmet's viewplate. Despite its advantages, the Phase I armor proved uncomfortable for the troopers to fit in, which was due to the Kaminoans' unfamiliarity with human ergonomics. The armor's design was reminiscent of the Mandalorian armor, including the helmet with a distinctive T-shaped visor. The bodysuit was also pressurized, offering temporary protection against the vacuum of space, and the body glove protected the clone from the extreme cold and heat. Those plates were sealed to a black temperature control bodysuit via magnatomic gription panels. Custom Phase I armor, with red color scheme, pauldrons and kama addedĬreated by Kaminoan armorsmiths for the clone troopers of the Galactic Republic, the Phase I clone trooper armor consisted of twenty form-fitting plates of lightweight plastoid-alloy composite.

Phase 1 501st trooper