possess or operate a radio communication network; (b) possess or operate radio communication equipment, whether in assembled or unassembled form; or (c) erect a radio communication network, unless he has a valid radio licence issued by the Authority to do so. (2) Notwithstanding the provisions of subsection (1), a person who possesses or operates equipment which can be used only for receiving radio messages shall not require a licence. (3) Notwithstanding the provisions of subsection (1), the following shall be exempt from the provisions of subsection (1)— (a) the Botswana Defence Force; (b) the Botswana Police Force; (c) the Department of Civil Aviation: