While early prototypes were unsuccessful, lessons learned in the process paved the way for future advances in military sciences, construction, and fusion. Mechanized cavalry units provided with them would retain the mobility of a soldier moving on foot while giving them the ability to use heavy weapons with ease. With the resource crisis severely limiting the ability of the United States military to deploy combat vehicles, especially tanks and other types of armor, the military-industrial complex began research efforts to create self-powered combat suits in August 2065. Finally, in Fallout 4 and Fallout 76, power armor was developed into a separate gameplay system consisting of maintenance and repair not used for other armor, requiring periodic refueling with fusion cores and allowing in-depth customization. It serves less as a clear cut endgame armor and more of an endgame option for characters specializing in heavy armor. In Fallout 3 and Fallout: New Vegas power armor is still a profoundly protective armor but is gated behind Power Armor Training. In Fallout, Fallout 2, and Fallout Tactics it is effectively the endgame armor, wildly exceeding every other option in terms of protection and bonuses. In the games themselves, power armor is a highly protective type of sophisticated armor. Among these are the technologically advanced Brotherhood of Steel and the Enclave. ДЄfter the Great War, power armor rapidly became a precious, treasured item, with only a limited number of factions capable of maintaining or fielding them in substantial numbers, much less manufacturing them. China would still attempt to create their own versions of power armor but were already many years behind the United States. Stealth armor was the initial Chinese response, focusing on stealth and subterfuge, rather than head-on confrontations. The T-45 model played a crucial role in stabilizing the Alaskan frontlines at the time of its introduction, while the superior T-51 power armor and later models helped decisively shift the balance in the United States' favor during the Sino-American War. In response to burning through the cells at an alarming rate, later versions were manufactured with built-in microfusion packs. The first iteration of power armor successfully deployed in combat was the T-45 model, which originally ran on small energy cells. It represents the pinnacle of personal defensive technology, combining excellent protection from small arms with the ability to carry heavy weapons into combat with ease. Power armor is a personal infantry combat technology developed before the Great War by United States defense contractors. Raider modified power armor ( Tessa's Fist)

NCR salvaged power armor ( Scorched Sierra power armor ) Remnants Tesla armor ( Gannon family Tesla armor) T-45d power armor ( Brotherhood T-45d power armor) T-51b power armor ( Brotherhood T-51b power armor)

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