Which of the following is a mode of IFF?

Mode 1 is recognized as a mode of Identification Friend or Foe (IFF) specifically designated for military aircraft and operations. It is designed to provide identification capabilities for military missions, allowing friendly forces to distinguish their aircraft from potential threats. This mode enables engagement by providing the necessary information that is not available to non-military operators.

The significance of Mode 1 lies in its specificity to military use, ensuring that it is exclusively employed in situations that require enhanced identification and situational awareness in defense operations. By using different modes for different operators, the IFF system effectively minimizes the risk of friendly fire and assists in maintaining operational security.

In contrast, the other modes listed cater to different operational requirements and user groups, such as civilian or dual-use, further emphasizing why Mode 1's exclusive assignment for military use is critical for defense and tactical efficacy.