The T-60 series of powered combat infantry armor is an evolution of the T-45 power armor design. Originally an upgraded variant of the T-45, this stop-gap model was extensively modified and effectively reimagined, leading the United States military to reclassify it from an upgrade to a separate power armor model. Entering service after the conclusion of the Battle of Anchorage, mere months before the nuclear apocalypse, the T-60 was rapidly deployed and extensively used by the U.S. Army in all theaters to supplement the more difficult to produce T-51 power armor. Deployments of military units in T-60 power armor included the domestic front, enforcing order in the nation. By the Great War it was considered to be the most advanced model of power armor to see extensive use.The T-65 series is a unique set of power armor that saw development right before the Great War but also never saw widespread deployment or production. The only known units to exist were in service by the Secret Service stationed at Vault 79. T-65 series utilizes radically different protection principles from the previous power armor series with a departure from whole cast armor pieces to segmented armor layers notable in the torso piece and the pauldrons. This allowed the T-65 series to protect exposed frame sections and other areas that would be thinly armored on other power armor series and greatly increasing protection and survivability.
As with other power armor models, the T-60 is designed for a single operator. Compared to the T-45, the T-60 is much more heavily armored, although it lacks the sophisticated armor pattern of the T-51. The end result is an extremely protective armor system, though protection comes at the expense of agility and a reduction in battlefield awareness, as the additional power pack armor plating reduces rear visibility together with the oversized pauldrons. As usual for T-series power armor, the helmet completes the ensemble and includes an air filtration system, a bullet-proof vision slit, an electric lamp, and external ports that allow the operator to listen to his surroundings and double as attachments points for extensions. The standard upgrade is a drop-down ocular.
Any shortcomings of the T-60 were compensated for through deployment: a T-60 power armor unit was usually deployed with support from light infantry units, equipped with energy weapons. After the Great War, T-60 power armor became a rare sight until the reformed Brotherhood of Steel under ElderArthur Maxson recovered a substantial number of these suits and adopted the T-60 as the service uniform of its soldiers.
The standard T-60 model typically features dark steel or light blue paint on the majority of the body, with white markings on sections along the inside of the forearms. It was the most advanced model of extensively used power armor before the Great War.
An upgraded variant of the T-60 outfitted with multiple heavy-duty electrodes connected via thick cabling. This variant is utilized by Ivey, the leader of the technological, robot-focused Rust Devils. The upgrades allow the user's damage output with energy weapons to increase substantially.
“Our primary goal with the power armor was to make it feel less like a suit that you'd wear and more like a vehicle you'd operate. this design began as a reimagining of the T-45d, but it was different enough that we dubbed it the T-60. This way we could bring the T-45 back as its own variant. Although the look was settled on early, some details and proportions were revisited when we adapted the power armor to work as a modular system of plates that attached to a standardized endoframe. In this early version, the arms and legs needed more bulk to make room for the operator and the frame.”— The Art of Fallout 4
↑The Art of Fallout 4 p.13: "Our primary goal with the power armor was to make it feel less like a suit that you'd wear and more like a vehicle you'd operate. this design began as a reimagining of the T-45d, but it was different enough that we dubbed it the T-60. This way we could bring the T-45 back as its own variant. Although the look was settled on early, some details and proportions were revisited when we adapted the power armor to work as a modular system of plates that attached to a standardized endoframe. In this early version, the arms and legs needed more bulk to make room for the operator and the frame."
↑Fallout 4 loading screen hints: "The T-60 series of Power Armor saw extensive use by the United States Army after the Battle of Anchorage. In fact, soldiers in T-60 Power Armor were among those trying to retain order on October 23, 2077 - the day America fell to atomic war..."
↑Fallout 76 loading screen hints: "The most advanced suits of Power Armor to see extensive use were the T-60 models. By the time of the Great War, they were a common sight in all U.S. military engagements."