Steadfast BOS combat armor chest piece

The Steadfast BOS combat armor chest piece is a unique armor in Fallout 4.

Characteristics
This chest piece grants increasing energy and damage resistance the lower your health (Up to 35%). Oddly, changing the armor material to something besides Brotherhood at a work bench will not remove the "BOS" from the armor's name.

Locations
Obtained from Lancer Captain Kells at the end of the quest "The Lost Patrol" if you turn the quest in to him instead of Paladin Danse, and if you have convinced Paladin Brandis to rejoin the Brotherhood.