Which of the following units requires a minimum staffing of 1 each?

The correct answer is the Community Safety Liaison (CSL), which requires a minimum staffing of one individual. This unit serves a critical role in engaging with the community, addressing safety concerns, and facilitating outreach programs. Proper staffing ensures that the CSL can effectively fulfill its mission of improving public safety and building relationships within the community.

In comparison, other units like Heavy Tankers, District Officer Vehicles, and Rescue 6 may have different staffing requirements depending on their operational functions or the specific demands of their responses. They often require more personnel to handle the complexities associated with larger equipment or more significant emergency responses, emphasizing the unique role the CSL fulfills within the Oklahoma City Fire Department.