Atom's Bulwark

Atom's Bulwark is a unique piece of armor in the Fallout 4 add-on Far Harbor. Although its appearance is that of Marine armor, it uses the weight value and accepts mods from combat armor (this also means it can spawn in light, sturdy, or heavy).

Characteristics
It provides a Damage Resistance and Energy Resistance of 15 at 0 Rads, equal to combat armor. This armor value increases in accordance with the current Radiation level, up to 60 at 90% or more Rads.

Location
Rewarded by visiting High Confessor Tektus after completing Reformation.