N.H. Rev. Stat. Ann. § 176:10

Any person who served for not less than 90 days in the armed forces of the United States during "any war in which the United States was engaged, and received an honorable discharge from such service," shall be given preference in appointment under the provisions of RSA 176:7, RSA 176:9, RSA 177:4, and RSA 179:59, if qualified for such positions.