N.H. Rev. Stat. Ann. § 216-A:3-h

Any person recognized by the commissioner of the department of natural and cultural resources as a volunteer and who is under the general supervision of authorized department of natural and cultural resources personnel, and is actually performing assigned volunteer duties or activities at a state park, forest, reservation, trail, or historic site, shall be considered a state employee for the purpose of defense and indemnification from civil suits under RSA 99-D.