Mode 2 is utilized by whom and has how many digit identifier?

Mode 2 is specifically utilized by military aircraft and is identified through a 4-digit code. This is part of the secondary surveillance radar system meant for identification friend or foe (IFF) purposes. The use of a 4-digit identifier allows military aircraft to provide a more precise identification method, distinguishing them from civilian traffic and enhancing situational awareness on the battlefield.

The 4-digit identifier is critical for military operations, particularly in situations where identification and verification of friendly forces is essential to avoid friendly fire incidents, as well as to ensure proper coordination in joint operations. This unique coding system reflects the military's specific needs for identification, communication, and operational security.

In contrast, other options refer to different modes or identify the incorrect number of digits that do not align with the established military identification standards for Mode 2. Understanding the distinct features of Mode 2 helps in appreciating how military aviation maintains safety and security in complex operational environments.