What are units of any type of resources, temporarily assembled for specific tactical missions, called?

The term describing units of any type of resources that are temporarily assembled for specific tactical missions is known as a "task force." A task force is typically organized to focus on a particular objective or operation, bringing together various resources, personnel, and equipment to achieve a specific goal efficiently. This temporary assembly allows for flexibility and rapid response to incidents, where different types of resources can be deployed as needed.

Task forces are particularly effective in situations where a coordinated approach is required, such as during large-scale incidents or emergencies that demand specialized skills and equipment. By concentrating resources and personnel under a unified command, task forces can adapt quickly to the changing dynamics of the situation at hand.

In contrast, the other options refer to different organizational concepts. A strike team, for example, is usually a small, specific group with a focused mission, often within the context of firefighting. A group generally pertains to a broader assembly and might not imply the same level of coordination for a targeted tactical mission. The term "unit" is more generic and does not specifically convey the temporary and mission-oriented nature that is characteristic of a task force. Thus, the most accurate term for this context is "task force."