I am a member, and the current president of the Marshall County Amateur Radio Association. My call sign is KM4JZJ, and the club call is KI4HUS. When we do field day as a club, we always use the club call. If we do other contests as a club, we use the club call. Groups, such as church's, scouts, VFW's, schools, and so on, that are not ham clubs do not have a call sign. With that said, if those said groups start or have a ham club, such as some schools do, then the ham club within that organization, such as schools, can have a call sign.