N.J. Stat. § 43:17-36
When, in any municipality where there is a volunteer department doing public fire duty, which has a relief association organized by it and acting under this article, there is thereafter organized therein a paid fire department, the members who compose the paid fire department shall, without any election thereto, become members of and beneficiaries in the relief association, and shall take part in its control and management together with the former members thereof in such manner and form and to such an extent by representatives and trustees as may be agreed upon mutually by and between the members of the volunteer and the paid department, and on failure to reach an agreement within a reasonable time, then under such general rules and regulations as shall be made and adopted therefor by the executive committee of the New Jersey State Firemen's Association, which body may make, adopt and enforce such general rules and regulations as may be deemed necessary for such purposes and may preserve the funds and carry out the purposes of the relief associations.
N.J.S. § 43:17-36