N.J. Stat. Ann. § 43:9-6.1

1. An employee of any county, who is a veteran of any war, or who was a member of the American Merchant Marine during World War II and is declared by the United States Department of Defense to be eligible for federal veterans' benefits, and is a member of any retirement system may, at any time, apply to withdraw from the system during the continuance of his employment. Upon his making application, of which 10 days' notice shall be given, he shall receive, upon demand, the amount of his payments with interest thereon at the rate of four per centum (4%) per annum, without prejudice to his rights as a veteran to any benefit to which he may be entitled under any other law.