means a pension, annuity, retirement, or similar plan (except a plan covered under the Employee Retirement Income Security Act of 1974 (
29 U.S.C. 1001 et seq.) or a plan or program financed by contributions required under chapter 21 or 22 of the Internal Revenue Code of 1986 (
26 U.S.C. 3101 et seq., 3201 et seq.)) established or maintained by an agency, for any of its officers or employees, regardless of the number of participants covered by the plan; and