In Battle Drill 13, what is the main action to be performed?

The correct answer focuses on the action of mounting a BFV (Bradley Fighting Vehicle) and ICV (Infantry Combat Vehicle) during Battle Drill 13. This drill is crucial for cavalry scouts and involves mobilizing and repositioning troops quickly and effectively in response to battlefield situations.

The emphasis on "mounting" is significant because it entails not only entering the vehicles but also preparing for their operation and movement, which is vital in ensuring the unit's readiness to engage or react to threats. This aspect of the drill showcases the importance of vehicle operations in modern cavalry tactics, emphasizing speed and response in dynamic combat environments.

In this context, securing the area and controlling shock in a casualty, while important actions in military operations, do not directly align with the primary objectives of Battle Drill 13. Instead, they are more related to other drills that emphasize securing terrain or managing medical emergencies. Dismounting a BFV would also not be the primary action here, as this drill specifically highlights the need to effectively mount the vehicles to facilitate movement and combat readiness.