Originally developed and manufactured for the United States Army by American defense contractor West Tek,[1] the T-45d power armor was the first version of power armor to be successfully deployed in battle.In 2067, the first suit of T-45d power armor was deployed in Alaska during the start of the Anchorage Reclamation in the midst of the Sino-American War. This power armor was incredibly effective against Chinese tanks and infantry. Its ability to allow a single infantryman to carry heavy ordnance that otherwise required a team of soldiers to transport and operate became key in various localized conflicts on the Alaskan front, and it allowed American soldiers wearing the armor to destroy entire towns occupied by Chinese troops without endangering themselves.In 2076, the more advanced T-51b power armor variant was introduced into combat duty. After the Great War, this model of power armor is still being used by factions such as the Brotherhood of Steel. While main forces of the Brotherhood in New California and the Mojave Brotherhood of Steel tend to use the newer T-51b, more remote chapters, such as the East Coast Brotherhood of Steel and the Brotherhood Outcasts, have to rely on these outdated suits.