The purpose of sections 49-617, 68-621, 72-249, 72-1302 to 72-1304, 81-101, 81-102, 81-1021, 83-101.08, 83-107.01, 83-108, 83-112, 83-135, 83-139, 83-140, 83-144, 83-145, 83-147 to 83-150, 83-153 to 83-156, 83-170 to 83-173, 83-186, 83-188, 83-443, and 83-901 to 83-916 is to establish an agency of state government for the custody, study, care, discipline, training, and treatment of persons in the correctional and detention institutions and for the study, training, and treatment of persons under the supervision of other correctional services of the state so that they may be prepared for lawful community living. Correctional services shall be so diversified in program and personnel as to facilitate individualization of treatment.