How many ground engagements must the gunner perform?

The correct answer reflects the required minimum number of ground engagements that a gunner must complete to demonstrate proficiency during training and certification. In the context of the Avenger system, performing two ground engagements allows for a comprehensive assessment of a gunner's skills, including accuracy, speed, and overall tactical decision-making under simulated operational conditions. This ensures that the team can effectively operate the weapon system in a variety of scenarios.

Completing two engagements strikes a balance between providing sufficient practice and assessment without overwhelming the trainee. It also aligns with training standards that emphasize repeated practice to solidify the gunner's abilities in a real-world context.