How is a military training route operating at or below 1,500 feet AGL designated?

Military training routes operating at or below 1,500 feet AGL (Above Ground Level) are designated using "IR" or "VR" prefixes followed by a four-digit number. The "IR" designation indicates an instrument route, which is typically used for operations under instrument flight rules, while "VR" indicates a visual route, intended for operations that can be executed visually.

The four-digit numbering system allows for greater specificity and categorization of these routes, serving to enhance situational awareness for both military and civilian pilots. This system facilitates coordination between various types of air traffic, supports effective route usage, and aids in maintaining safety in airspace where military operations may occur.