What is the minimum number of USMS vehicles required for box containment?

• A. Requires a minimum of 3 USMS vehicles to be at a natural/complete stop
• B. Requires a minimum of 2 USMS vehicles
• C. Requires no minimum number
• D. Requires at least 5 USMS vehicles

Answer: (A)

Box containment is a tactic where vehicles form a perimeter around a fleeing target to slow and control the stop while reducing risk to bystanders. The minimum number needed to reliably create a complete, stable perimeter is three. One vehicle places in front to block forward progress, another directly behind to prevent a rapid retreat, and a third off to the side to close the remaining gap and restrict lateral movement. With only two vehicles, gaps can be exploited by the suspect, making a controlled, safe stop much harder and increasing the risk to all involved. Having three vehicles provides a solid box that supports a safer, more controlled stop and easier custody later.