On March 4, 2016, it was formally announced that the North American Hockey League's other Tier III league, the North American 3 Eastern Hockey League (NA3EHL), would be added to the NA3HL beginning with the 2016–17 season. The former NA3EHL teams became two new divisions within the NA3HL. On May 21, 2016, the Missoula Bruins youth hockey organization from Missoula, Montana, announced it had been approved as an expansion team in the Frontier Division of the NA3HL. The Missoula Junior Bruins replaced the Missoula Maulers of the Western States Hockey League after arena negotiations with the Maulers' owner fell through.