What is one of the terrain flight modes?

Contouring is recognized as a terrain flight mode primarily because it involves maneuvering the aircraft in close proximity to the terrain's features, following its contours. This technique is particularly useful for maintaining a low altitude and effectively reduce the risk of detection or engagement by enemy forces. Pilots utilizing contouring can leverage natural obstacles for cover while navigating, which is crucial for operations in hostile environments.

This method allows for enhanced situational awareness and the ability to execute precise movements tailored to the terrain, making it an essential skill for pilots operating in challenging landscapes. These aspects underscore why contouring is the correct answer in the context of terrain flight modes.