CSM Daniel K. Elder goes on to explain, "In 1968 when the Army added the rank of command sergeant major, the specialist ranks at E-8 and E-9 were abolished", because they were notional rather than actual. "In 1978 the specialist rank at E-7 was discontinued and in 1985, the specialist ranks at E-5 and E-6 were discontinued." These specialist ranks were created to reward personnel with higher degrees of experience and technical knowledge. Appointment to either specialist or non-commissioned officer status was determined by military occupational specialty (MOS). Different military occupational specialties had various transition points. For example, in the band career field (excluding special bands at D.C. and West Point), a bandsman could not achieve non-commissioned officer status until pay grade E-6 was attained. In some military occupational specialties, a soldier was appointed either a specialist or non-commissioned officer depending on which particular position or "slot" that he filled in his organization. A cook was a specialist, while a mess steward held the rank of sergeant (E-5 through E-7). Specialist grades paralleled the corresponding grades of non-commissioned officer (E-4 through E-7) only in terms of pay. The specialist grades, although they outranked the enlisted grades (E-1 to E-3), were outranked by all non-commissioned officers (E-4 to E-9) and lacked the authority conferred on an NCO. This is the major differentiation between a specialist and a "hard striper". Only the lowest specialist grade survives today and the rank of specialist 4 simply became known as "specialist", which is how it is referred to today. While the official abbreviation was changed from "SP4" to "SPC" upon the elimination of the SP5 and SP6 ranks, the SIDPERS database was initially authorized to continue using SP4 until such time as the change could be made at little or no additional expense in conjunction with other system upgrades. The continued use of SP4 on automatically produced documents (transfer orders, leave and earnings statements, unit manning reports, "inter alia"), hampered the adoption of the new abbreviation (and, to a lesser extent, the absence of "-4" in the non-abbreviated rank) by individual soldiers who viewed the computer-produced documents as the final word on what the proper term was. Today, the rank of specialist is the typical rank to which privates first class are promoted after two years of service, although PFCs may be waived into the rank of specialist after 18 months' time in service and six months' time in grade.