Diamond D (of D.I.T.C.) and MC Master Rob comprised Ultimate Force. They released a 12" record on Jazzy Jay's Strong City Records in 1988. Their LP, which was supposed to be published in 1990, is now being issued as a double CD in 2007, replete with acapellas and instrumentals. Supreme, Chilly B. Ware, and DJ Spinmaster are members of the Los Angeles-based group. Supreme was born in Brooklyn, New York, but all of his albums were distributed by the Los Angeles-based Party Crew Records label. This group is not to be confused with Diamond D and Master Robs's group, which recorded "I'm Not Playing" on Strong City Records in 1988.