What altitude range is typically designated for helicopter operations in the NOE terrain flight mode?

In the context of helicopter operations, the term "nap-of-the-earth" (NOE) refers to a flying technique where the pilot maneuvers the helicopter at very low altitudes, typically just above the ground, to enhance the aircraft's concealment from enemy forces and to take advantage of the natural terrain for navigation and protection. The altitude range designated for NOE operations is generally considered to be 0-25 feet.

Operating within this altitude range allows pilots to minimize their visibility to potential threats while also mitigating the risk of detection. At these low altitudes, helicopters can utilize trees, hills, and other terrain features to remain hidden and navigate more effectively. This technique is crucial for missions that require stealth and agility in hostile environments, making the 0-25 ft. range the most suitable choice for NOE operations.