Virginia Retirement System; service credit for career and technical education teachers. Provides that a member of the Virginia Retirement System shall be eligible for additional years of service credit for service earned as a teacher in the field of career and technical education. The amount of service credit earned shall determined as follows : (i) for service earned as a member who is 45 years of age or older but younger than 55 years of age at the time of such service, such service shall be multiplied by the weighted years of service factor of 2.0 and (ii) for service earned as a member who is 55 years of age or older at the time of such service, such service shall be multiplied by the weighted years of service factor of 2.5.