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Let me clarify.... If a Sergeant is lucky enough to get the Discretionary promotion while performing duty in an Investigative Track, ie Narco, Squad, Intel, IAB, etc. his/her rank would be SDS. If that same Sergeant assigned is to a Patrol / Unit, the rank would then be SSA.. If the SSA now gets transferred to an investigative unit, his/hers rank with change over to SDS... visa versa ..