The armor is also known as Advanced power armor Mark 2, Advanced Mark II, and Advanced Power Armor Mark II.
The set consists of two pieces, the body armor, and helmet. Like all power armor, power armor training is required to equip it. It provides +1 Strength and -1 Agility. There is also a 5% increase to Radiation Resistance.
↑Fallout 3 Official Game Guide Game Of The Year Edition p. 130: "This is also known as Advanced Power Armor Mark 2. The Enclave sacriﬁce part of the Strength bonus, but there is less Agility penalty with this armor. It is also slightly more hard-wearing."
↑The Lone Wanderer: "So... Any thoughts on the Enclave?" Bowditch: "They're sporting some pretty impressive Power Armor, I'll give them that. The Advanced Mark II. But that's all right. With a few modifications, our own armor will more than handle anything they throw at it." (Bowditch's dialogue)
↑The Lone Wanderer: "So... Any thoughts on the Enclave?" Peabody: "So they have Plasma weapons! Bah! It's strong technology, I'll give you that, but limited in modability. I've already started removing the compensators on our laser weapons to cut through the Black Devil power armor of theirs. We'll drop them like any other meat, don't you worry." (Peabody's dialogue)