What is one type of Immediate Action drill?

An Immediate Action drill refers to a set of procedures that a squad must follow to respond quickly to a specific situation or threat. The Air observation and attack drill is categorized as an Immediate Action drill because it involves rapid coordination and response to air support, ensuring that ground forces are prepared to engage with air assets effectively for maximum impact. This drill emphasizes the need for immediate and decisive action when air support is available and is critical for ensuring the safety of troops on the ground while maximizing the effectiveness of the air resources.

In contrast, the other options represent different types of drills that are not categorized as Immediate Action drills. Each has its own context and purpose, such as ambush countermeasures, which focus on responding to enemy ambushes, reconnaissance drills that prepare teams for gathering intelligence, and withdrawal drills that address how to retreat from a situation safely and effectively. While all are crucial for various operational scenarios, only the Air observation and attack drill directly aligns with the definition of an Immediate Action drill.