The armor is identical to recon armor in terms of stats and looks except for an increased durability (item health of 600 compared to 400 for the standard armor). The helmet is a recon armor helmet with increased durability (item health of 70 compared to 40 for the standard helmet) and an additional bonus of +1 to Perception.
Composite recon armor and composite recon helmet can be found in the game files of Fallout 3 but are not used anywhere in the game. They can only be obtained by using console commands. The add-onBroken Steel adds another (identical) version of the helmet to the game which is worn by the armory master.
Scribe Rothchild and Elder Lyons mention a variant of recon armor in passing after Who Dares Wins. One of them will strike up a conversation with the other about "Mark II recon armor," to which the other will reply that it is not yet operational.