Which of the following is true about military training routes?

Military training routes are specifically designed to facilitate military flight training maneuvers and activities. These routes allow military aircraft to conduct high-speed, low-altitude training without interfering with the operations of civilian aviation. While civilian pilots may need to be aware of these routes and may sometimes share airspace with military flights, the primary purpose of these training routes is to support military operations and training exercises.

The other options do not accurately describe military training routes. They are not exclusively for civilian pilots, as they are primarily utilized by the military. There is no blanket requirement that all aircraft must remain at least 10 miles away from the routes; instead, pilots should follow appropriate traffic advisories and maintain situational awareness when flying near these areas. Furthermore, military training routes are not restricted to nighttime use; they can be utilized at any time during the day or night as required by military operations.