Radio assignment and use by Fire Explorers (or any other Explorer) is based on what their sponsoring Fire Department decides it will be. This includes the purchase of radios (FRM/GMRS) with their own funds. As an auxiliary unit of that Department, it is the responsibility and authority of the adult officers to make this kind of determination. There was one such Explorer group in NJ that made their own decisions, purchased equipment, made false assumptions about licensing, and ran into operational and legal problems that could have been easily avoided by following the Chief's and Post Committee's direction.
In summary, for both posts, it is the sponsoring Department that makes the decisions and the rules for their Explorers - for their protection against themselves and compliance with law.