The present invention discloses a movable operation support system, used in clay target shotgun shooting learning, games and competition, which can be set up and operated in any location of the field. A preferred embodiment of the system is composed of a mobile support device used to transport in any position of the shooting field a multi-target release control panel, a portable safety screen that is carried, positioned at each shooting station to assure safety of the shooting, a plurality of mutable station indicators that can be placed randomly on the course and a release cable assembly that connects the clay target throwing machines to the multi-target release control panel. Further a pivoting arm clears the way for the mobile support device by guiding the cables. Additionally a hulls collection box is attached to the portable safety screen and the mobile support device, helping to maintain a clean field.