This regulation applies only to an individual who: Is employed by: A county board of education; The Board of School Commissioners for Baltimore City; The State; or A participating governmental unit; and Works in an ancillary educational program on a 10-month school year basis instead of a 12-month calendar year basis. Subject to §C of this regulation, at retirement or on receipt of a vested allowance, a member or former member of the Employees' Pension System, Employees' Retirement System, Teachers' Pension System, or Teachers' Retirement System shall receive 1 year of creditable service for each year that the member or former member worked on a 10-month school year basis. At retirement or on receipt of a vested allowance, the creditable service of a member or former member shall be pro-rated if the member or former member: Participated in the Employees' Pension System or the Teachers' Pension System; and Worked less than the minimum number of hours to be completed by a full-time employee serving in the member's position.