S.C. Code Ann. § 24-5-370

A currently certified full-time detention officer who leaves his position under honorable conditions within twelve months, at the request of his director and with the concurrence of the South Carolina Criminal Justice Academy, may be issued a registration card identifying him as a member of the reserve if the use of reserve detention officers has been approved by the responsible authority. The officer is not required to undergo the preliminary training for reserves but is required to have a current physical exam and to continue the same annual in-service training requirements as regular full-time detention officers.