Chapter 20. Retirement of Public School Teachers. Subchapter I. Retirement Before June 30, 1946. §§ 38-2001.01 – 38-2001.19 Subchapter II. Retirement After June 30, 1946. §§ 38-2021.01 – 38-2023.16 Subchapter III. Retirement Incentive Program. §§ 38-2041.01 – 38-2041.01 Subchapter IV. Miscellaneous. §§ 38-2061.01 – 38-2061.02