All Space Marine Chapters maintain a number of suits of the revered and rightly feared Tactical Dreadnought armour, or Terminator armour as it is more commonly known. Terminator suits are the pinnacle of armoured protection available to a Space Marine. Each is all but impervious to small arms fire and can even withstand the merciless onslaught of tank-busting Krak Missiles.
Terminator armour is incredibly rare. Space Marines hold it a great honour to be permitted to wear such a suit to battle, and it is only member's of the Chapter's elite 1st Company that this honour is granted. Once trained in the use of Terminator armour, a Space Marine is counted first amongst his brothers and is expected to conduct the most difficult of missions and perform beyond even the lofty standards of the Adeptus Astartes. Boarding Tyranid-infested Space Hulks, launching teleport attacks, Titan assaults, and combat actions in extremely hostile environments, such as deep space or volcanic marshland; these are the missions undertaken by Space Marine Terminators.
Truly are Terminators amongst the greatest heroes of Mankind, bold warriors in whom the indefatigable heroism of a Space Marine is combined with terrible weaponry and indomitable mass of Tactical Dreadnought armour. No foe is safe from a Terminator assault, not a horde of Orks, adamantium fortress or colossal Chaos Titan, Terminators are invincible, they are unstoppable and they never yield.