Section 5523 - Vested right to service pension(a) An employee who is not a post-2011 employee and who has 5 years of credited service exclusive of service under § 5501(e)(4), (5) and (12) of this title shall have a vested right to a pension. A post-2011 employee who has 10 years of credited service exclusive of service under § 5501(d)(12) of this title shall have a vested right to a pension.(b) A former employee's vested right shall be forfeited upon an application for a refund of the former employee's accumulated contributions. 29 Del. C. 1953, § 5523; 57 Del. Laws, c. 592, § 1; 60 Del. Laws, c. 483, § 17; 63 Del. Laws, c. 423, §3; 66 Del. Laws, c. 370, §2; 67 Del. Laws, c. 124, §4; 70 Del. Laws, c. 186, § 1; 70 Del. Laws, c. 524, § 8; 78 Del. Laws, c. 14, § 12.;