Which of the following are types of rehearsals?

The correct answer highlights specific types of rehearsals that are commonly utilized in military operations to ensure that all participants are synchronized and understand their roles within a mission. A backbrief is a critical rehearsal where subordinates communicate their understanding of the mission to their superiors, ensuring clarity and alignment on objectives. The combined arms rehearsal focuses on integrating different units and capabilities, such as infantry, armor, and support elements, to enhance operational effectiveness. Lastly, a battle drill rehearses specific actions performed under certain conditions, which helps prepare units for rapid execution during real-life scenarios.

These rehearsals are essential for improving unit cohesion, understanding the mission scope, and refining tactics before engaging in actual operations, thereby increasing the likelihood of success on the battlefield. In contrast, other choices present terms and concepts that do not fit the definition of rehearsals as practiced in a military context.