Open up UnrealED.
Go to Actor Classes in the side box
Go to Pawn - CtPawn - Republic - CloneCommando
Double click any member of delta squad (in this case Sev)
Go to Pawn - Available Accessories and click Add
Under AcessoryClass select CloneShoulderPad_L
Under Bone Name write ShoulderPad_L
Under Is Required, select True.