§ 243-a. Non-contributory retirement service credit for members of the New York state and local retirement systems or the New York state teachers' retirement system called to active military duty on or after August first, nineteen hundred ninety. Notwithstanding any other provision of law, any member of the New York state and local employees' retirement system, the New York state and local police and fire retirement system, or the New York state teachers' retirement system who is called to active military duty on or after August first, nineteen hundred ninety and prior to January first, nineteen hundred ninety-three, who is not receiving full salary from a participating employer and is otherwise eligible to receive retirement service credit in such system for such active military duty pursuant to section two hundred forty-two or two hundred forty-three of this article, shall not be required to make member contributions to receive such credit.