Should a for­mer mem­ber desire to again affil­i­ate him­self under the mer­it sys­tem with the Sheriff’s Depart­ment, he must once again meet the basic require­ments for appoint­ment to the Sheriff’s Depart­ment and suc­cess­ful­ly com­plete the screen­ing process in com­pe­ti­tion with all oth­er appli­cants.  Any tenured per­son­nel appoint­ed to fill an unex­pired term of Sher­iff shall retain his tenured posi­tion upon com­ple­tion of his appointive term.