Which of the following are types of drills?

Battle Drills and Crew Drills are recognized as essential types of drills within military training. Battle Drills are standardized actions taken by a unit in response to specific enemy actions. These drills are critical for developing soldiers' reflexes, enhancing teamwork, and ensuring that units can operate effectively under the stress of combat. The focus on rehearsing these drills prepares soldiers to act swiftly and decisively in dynamic environments.

Crew Drills, on the other hand, refer to practices focused specifically on a crew's operation of equipment or systems, such as vehicles or weaponry. The emphasis here is on ensuring that every member of the crew understands their role and responsibilities, which contributes to the overall efficiency and safety of operations when engaged in critical missions.

Both types of drills complement each other in preparing units for various scenarios they might face, which is essential for maintaining operational readiness. The pairing reinforces team cohesion and allows units to conduct operations seamlessly. Other options may reference various drill types but do not align with the standard terminologies and recognized categories applicable in military training.