Which refuel method involves vehicles entering a site for refueling, receiving a predetermined amount of fuel, and then moving out to return to their convoy or formation?

The correct refuel method is refuel on the move. This approach is characterized by vehicles entering a refueling site, receiving a set amount of fuel, and then moving back to rejoin their convoy or formation. This method is particularly efficient as it minimizes the time vehicles spend stationary, allowing for continuous movement of military formations while still ensuring they maintain adequate fuel levels.

The essence of refueling on the move is to enhance operational tempo and maintain momentum during missions, making it a fundamental tactic in military logistics. This method is primarily utilized in environments where speed and mobility are critical, ensuring that forces can remain agile while still addressing logistical needs.

In contrast, the other methods focus on different aspects of the refueling process. Refuel in place typically requires the vehicles to stop for a longer period at a designated location. Over-the-shoulder refueling generally refers to an operation where fuel is transferred from one vehicle to another without extensive stationary setups, and contingency refuel relates to emergency or planned refueling scenarios under specific operational conditions, which may not involve the rapid rejoining of a unit.