(a) A member who has made contributions on all his salary received from September 1, 1939, to his retirement date, and who began to make his retirement contributions before September 1, 1941, shall receive credit for his service before September 1, 1939, with the National Reemployment Service.

(b) A member who was an employee of the United States Employment Service in Connecticut shall receive credit for his service with the United States Employment Service if he complies with all the requirements for obtaining service credit in § 5-181.

(c) The retirement salary of any employee of the Department of Transportation who was employed by the state at the Charter Oak Bridge, transferred to employment with the Greater Hartford Bridge Authority and subsequently taken back into state service shall be computed as though such employee were a member of part A of the state employees retirement system, provided an amount equal to the percentage of any Social Security payments made to such employee, which percentage is attributable to his employment by the state, shall be deducted from such retirement salary.

(d) Any employee of the radiological maintenance and calibration facility shall be credited for retirement purposes under this chapter with such employee’s period of full-time service commencing with the date upon which such employee began work at said facility under individual contract with the Commissioner of Emergency Services and Public Protection upon payment into the State Employees Retirement Fund of such contributions as such employee would have paid if such employee had been a state employee during the period of such service and such employee’s salary for such service had been paid by the state, with five per cent interest on such contribution from the date of such employee’s entry into such service to the date of payment.

(e) Any former employee of the Connecticut Development Commission or the Connecticut interregional planning program who is an employee in the state classified service and who has had continuous state service since employment or reemployment in the state classified service shall be credited for retirement purposes under this chapter with his period of full-time service during the period commencing January 1, 1961, and ending December 31, 1966, including service under individual contract with the state and for the time period covering his transition between contract service and classified service. Such employee shall make payment into the State Employees Retirement Fund of such contributions as he would have paid if he had been a member of the state employees retirement system during the period of such service, with five per cent interest on such contributions from the date of his entry into such service to the date of payment.