A Rigger III/Rigging Assistant's primary role is to assist in the setup, operation, and maintenance of rigging equipment for lifting and moving heavy loads. This includes tasks like inspecting and preparing rigging gear, securing loads, and assisting with the movement of equipment, all while adhering to strict safety protocols. They work under the supervision of a Rigger or Rigger III, providing crucial support in various industries like construction, oil and gas, and maritime operations.