Hardened power armor

A suit of T-51b Power Armor which has undergone a special chemical hardening process, improving the defensive capability of this high-tech armor system. Retains the original's bonuses: +3 Strength and +30 Radiation Resistance

Fallout
Can be hardened in Boneyard by Miles (one suit, Chemistry Journals needed).

Fallout 2
Crockett, San Francisco, at Hubologists' HQ (2 suits)