The Brotherhood of Steel worked on modifying recon armor, calling their prototype "Mark II Recon Armor."[1] The Fallout 3 Official Game Guide describes it as light armor, with extra speed and agility.[2]
↑Owyn Lyons: "Scribe Bowditch, I trust you are well. I'm here for your progress report on the modified Recon Armor." Bowditch: "Ah... you're a bit early today, sir. Regardless, I'm happy to report that the development of the Mark II Recon Armor unit is proceeding as planned." Owyn Lyons: "I'm pleased to hear that. Do you anticipate any setbacks? Last month's progress was, well... let's call it 'underwhelming.'" Bowditch: "There may be a slight delay in the enhancement of the ambulatory gyroscope. A few of the parts I need were lost in the recent... inventory reduction." Owyn Lyons: "You'll make do, Bowditch. You always do." Bowditch: "Thank you, sir. I appreciate it." (Owyn Lyons and Bowditch's dialogue)
↑Fallout 3 Official Game Guide Game of the Year Edition p. 200: "Which Power Armor will you choose? The full suit of Power Armor has more damage absorption, but less mobility. The Recon Power Armor is light armor, with extra speed and agility."