In Fallout 3 and Fallout: New Vegas, several training dummies can be found that resemble crude caricatures of people wearing this model of power armor while making a panicked/surrendering pose.It doesn't function as a disguise in random encounters, however. This armor works as a disguise when worn around Enclave members at the Oil Rig, making them non-hostile to the Chosen One.Prostitutes make comical, sexual remarks. When the Chosen One is equipped with advanced power armor, the non-player characters in New Reno will react, usually with crude comments.Navarro underground, in a locker near the armory master.More importantly, the garrison at Navarro was defeated by the New California Republic Army, effectively destroying the Enclave's presence in New California. The Enclave's confidence in its technological superiority allowed the Chosen One to infiltrate Control Station Enclave without a problem thanks to the assumption that only Enclave troops would wear these suits. However, while it was considerably powerful, it was not invincible. Enclave's insignia was proudly worn on the breastplates of armors, while rank indicators were typically placed on the arms of the suit. The combination of superior protection, mobility, and strength gave the Enclave a considerable advantage over wastelanders. Additional features include an auto-gyro and the ability to lock them in position, allowing the suit to be stored upright (or the operator to take a nap while on guard duty), an air conditioning system for comfort, a radio headset, and an urine-recycling system carried over from the T-51b, allowing the operator to survive for weeks without water. The basic hydraulics system and servo-motors that provide the operator with enhanced strength are also high-quality models, with improved performance as opposed to the original T-51b. Its angled surfaces also help maximize the chance of outright deflecting projectiles and incoming fire. The unusual, insect-like design features a pair of polarized eyepieces in place of the usual vision slit, providing superior battlefield awareness. Perhaps the most noticeable change was a completely new helmet assembly. Classic power armor pauldrons were retired in favor of a hump that encloses the operator's head, significantly reducing the chance of enemy fire damaging the vital areas surrounding the head. The resulting space savings allowed for reducing the armor's profile without compromising protection. While the T-51 power armor relied on a lightweight poly-laminate composite shell for protection, the advanced model uses lightweight metal alloys as a basis, reinforced with ceramic castings at key points. The X-01 advanced powered infantry combat armor is designed for a single human operator, provided with the comfort and protection of a next-generation suit of armor. Work on the model was restarted by the Enclave in 2198, although it wasn't until 2215 that the research efforts began in earnest under a presidential mandate, with the first production model created in 2220.

It represented a radical, new approach to designing powered armor, eschewing traditional armor design philosophies, but was never deployed in larger quantities until the 23rd century.

The first test batch of the armor, designated X-01 Mk I, was developed for presidential bodyguards, and served as the baseline for the remnants of the United States military, who developed it into a power armor tailored for the post-War wasteland.

The development of the first suit of advanced power armor, designated X-01, began shortly before the Great War.

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