A member of the VFW post, in the 300 block of North Lodge Lane, found an 81-mm, a 126-mm and a 105-mm round when post members were cleaning out closets, Havre de Grace Police Department Sgt. Everett Humphrey said.
The pieces were brought in to police headquarters on Pennington Avenue at about 11 a.m. and were found to be inert, or not dangerous, Humphrey said.
Aberdeen Proving Ground ordnance experts were called in to identify and dispose of the munitions.
Humphrey did not know how or where the munitions were disposed of, nor did he have more details about the nature or origin of the rounds.
A spokesperson for Aberdeen Proving Ground couldn't be reached for comment Friday afternoon.
The State Fire Marshal's Office said in a notice of investigation of the incident that the VFW member who brought the munitions to the police department stated they had been inside the building since the 1950s and were found during a cleanup of the quartermaster's office.