The variable portion of the USMS registration number is most helpful to meet directors and top ten recorders, since it helps identify current registration and LMSC of registration. I would not be in favor of eliminating it.

I especially think this additional information may come in handy in future years when trying to trace previous year's registrations. I am much more concerned about the possibility of a swimmer being assigned more than one "lifetime" registration no. when switching LMSCs or re-registering after a lapse of a year or two, and the attempt to trace that swimmer back to a registration number assigned in a previous registration year.