According to YOJO.COM:

Steel Brigade was first available in the sixth series (1987) as a mail-in offer from Hasbro Direct. The offer was hyped as a "personalized" figure, and came with a personalized bio certificate. It essentially was a figure made up of repainted parts from other figures with the head being the only original piece.

From the years 1987 through 1994, Steel Brigade was offered off and on from Hasbro Direct. As the years passed, different parts of different figures were recolored and used to create new variations of the Steel Brigade figure.

Our offering is the Version D release from 1989 in factory sealed baggie. The defining characteristics of Version D include Airborne legs and Cobra Soldier waist.  No leg or waist movement when tested. This is the first time we have offered this piece in our auctions. Encapsulated by AFA (85), #12146961