What is a type of craft that supports operations and is not designed for independent missions?

The correct answer identifies a type of craft designed primarily to support operations rather than engage independently in missions. Service craft are vital for logistics, maintenance, and fulfilling specific roles within a larger operational framework. They assist more capable vessels or units by providing necessary services such as refueling, repair, or transporting personnel and equipment to areas where larger combat or operational vessels cannot go.

Support vessels and patrol boats often carry out more proactive roles, involved in direct operations, which distinguishes them from service craft. While Navy boats can encompass a broad range of vessels, they do not specifically highlight the operational support aspect that is the hallmark of service craft. This distinction emphasizes the service craft's supportive role in conjunction with flotillas or fleets, prioritizing teamwork over independent action.