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

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. While the T-51 power armor relied on a lightweight poly-laminateceramic castings at key points. The resulting space savings allowed for reducing the armor's profile without compromising protection. 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. Perhaps the most noticeable change was a completely new helmet assembly. The unusual, insect-like design features a pair of polarized eyepieces in place of the usual vision slit, providing superior battlefield awareness. Its angled surfaces also help maximize the chance of outright deflecting projectiles and incoming fire. composite shell for protection, the advanced model uses lightweight metal alloys as a basis, reinforced with



SGT Arch Dornan:

"Welcome to camp Navarro, so you are the new replacement."

*Looks at you without the power armor*

"YOU ARE OUT OF UNIFORM SOLDIER, WHERE'S YOUR POWER ARMOR?!"

"Don't have any? YOU EXPECT TO ME BELIEVE THAT MAGGOT?!"

"The truth is, you lost an EXPENSIVE PIECE OF ARMY-ISSUE EQUIPEMENT."

That suit is going to come out of your PAY, and you will remain in this mans army until you are 510 years old, which is the number of years it will take for you to pay for a Mark II Powered Combat Armor you have lost!"

"Report to the armory and have a new suit issued to you, then report back to me, private! Dismissed!"