51st EAAB Phase III Armor

The Katarn-Class Phase III Clone Trooper Armor was the last  known development of Clone Trooper armor used by Clone Troopers. The Katarn-Class Phase III Clone Trooper Armor was developed in 8 BBY in secret by the Kaminoan Armorsmiths as replacement for the aging phase II and even some phase I armor still in use by the 51st. The Kaminoans were still loyal to the republic as they had burning hatred for the Empire. The Kaminoans happily agreed to the last Republic unit to make them a class of armor for there troops. The base development was taken from the Phase II ARC armor,the Katarn-Class Armor used by the republic commando's during the Clone Wars and some aspects from the stormtrooper armor.(I'll write a wiki page later)

-Helmet was based off the late Phase II helmet and the stormtrooper helmet to act as a form of psychological warfare where the
-HUD or heads up display that consistently displayed tactical data such as the location and distance to the target, the health of the wearer and the strength of the suit's shielding. The helmet could system link to others through the use of an internal communications antennae allowing each member of a squad to keep track of their comrade's health and location. Specialized internal sensors could detect the make, model, and relative accuracy of every weapon that a commando used, and could adjust the format of the targeting reticule for differing weapons. The Helmet had a built-in filtration system which could extract oxygen from toxic environments. The visor was designed to incorporate electrobinocular and night-vision modes.
armor was designed  to ensure that foes a united and implacable force, lowering the enemy morale during combat operations.
-inclusion of deflector shields
-Helmet had anti-flash blinding lenses protected the trooper against intense glare and provided them with enhanced combat vision or "Holographic Vision Processors" (which allowed vision through many barriers such as smoke, darkness and fire.
-easy bacta injection
-included additional pouches and holders for grenades, land mines, blaster ammunition, med kits, and even extra rations. 
-Stilith Alloy- shielded the armor against sensors and made the wearer almost invisible to the naked eye. could not be detected by droids.
-was reinforced against Verpine shatter guns and EMP weaponry featured further enhancements, being blaster resistant against ordnance up to laser cannon rounds and light grenades
-Full enclosed suit protection against biozard materials,radiation and thermal
-Complete protection from Sharapnel,Projectiles(Within reason) and completely flame proof and disperse over the surface area of the armor
-Built-in comlink
-retractable vibroblade used for close quarter combat and covert encounters
-armor last indefinitely
-Optional backpack that featured specialized ammunition cartridges that held various types of ammo, and was reconfigurable for many different missions, such as an extra oxygen tank for aquatic and space-borne environments, a large bacta dispenser for augmented healing, or even an external communications array for long distance communications (i.e. subspace transmissions). The backpack had a display on it that showed the last two digits of the individual commando's ID number. 
-Extremely lightweight

due to the expense of the new Phase III armor, only a select few of the 51st received the first suits of the new armor and it would take a few years before the entire battalion was fully equipped with the new armor. Much like the phase I and Phase II armor's, this armor was also maintained extremely well by it's users as if they were weapons to make sure they were in tip top shape. The 51st continued to use the Katarn-Class Phase III Clone Trooper Armor even after almost all the original clones of the 51st had passed away peacefully or by war and became the 51st signature and symbol just as the Stormtroopers of the Empire. The armor was still in use by the 51st Exclusively by the time of the formation of the Galactic Federation Triumvirate although by that time, it had been upgraded significantly with many variants.