The Mojave variant of the T-51b is a type of powered infantry armor. In order to wear the armor, the player must first acquire Power Armor Training, which can be obtained by completing the quest Still in the Dark and then completing Eyesight to the Blind or Tend to Your Business, or by completing For Auld Lang Syne. The armor is relatively rare in the Mojave Wasteland, as the Brotherhood of Steel, the only faction which regularly uses power armor, has their own faction-specific version of the armor. The brotherhood specific variant isn't as rusted as the regular variant, due to the Brotherhoods high maintenance of weapons and armor.
The armor is fitted with a back-mounted TX-28 MicroFusion Pack which generates an output power of 60,000 Watts to power the HiFlo hydraulic systems built into the frame of the suit. Made of a poly-laminate composite, the outer shell of the T-51b is lightweight and capable of absorbing over 2500 Joules of kinetic impact. The 10-micron-thick silver ablative coating can reflect laser and other radiation emissions without damage to the composite subsurface, and the eyeslit for the helmet is made of bullet proof glass to protect the wearer from any projectiles. The armor usually carries enough fuel to last for about a century. The armor is completely sealed, and offers excellent protection from Radiation.
One can be purchased at the armory in Hidden Valley bunker from Knight Torres, the Brotherhood quartermaster, along with helmets and T-45d power armor for repairing (after completing Still in the Dark and then Eyesight to the Blind or Tend to Your Business).
Another T-51b power armor and a helmet can be found in the deathclaw promontory on a dead prospector.
The T-51b power armor is different from the Brotherhood T-51b power armor because the chest, shoulder, and calf armor pieces, as well as a few other parts, are green instead of white/gray. This is similar to the differences between Fallout 3's version of the T-51b power armor and the winterized T-51b power armor.
When wearing this armor, back-sheathed weapons will be holstered differently than if the player was not wearing this armor. For example, when not wearing power armor, the player holsters the hunting shotgun with the butt of the gun behind the players right shoulder. With the armor on, the butt of the gun will now be behind the players right hip.
T-51b power armor, with 2000 hp, is the most durable armor in the entire game (without any add-ons installed), surpassing even Remnants armor, which has only 400 hp. In the lore, the Remnants power armor (advanced power armor Mk I) would greatly surpass the T-51b's ability to withstand damage, although it does provide 5 more DT.
ps3pcxbox360 When using large weapons like miniguns, the armor's hip will become see-through, and the player will appear hipless. [verified]
pc If spawning the armor portion of this set from the console, and if the PC is currently wearing it as well, the armor will not show up in inventory. It will apply the weight associated with carrying the armor however. This seems to be due to the fact that although you cannot view nor interact with the item it is indeed in your inventory. If you drop the set you are currently wearing, the newly spawned armor will appear in your inventory. [verified]