What is the only type of aircraft that can present a single-arc identification friend or foe (IFF) reply on a scope?

The military aircraft are equipped with advanced identification friend or foe (IFF) systems that enable them to send back a precise, single-arc response. This capability is essential for distinguishing between friendly forces and potential threats, particularly in combat or conflict scenarios. IFF systems help in enhancing situational awareness and ensuring that friendly units can operate without misidentification.

Military IFF systems are designed to follow specific protocols and standards that allow for accurate communication with radar systems. This contrasts with other types of aircraft, such as civilian or commercial balloons and blimps, which may not have the same level of technological capability to generate such responses. These other categories might not be equipped with IFF systems at all, and if they are, their responses can differ significantly—often lacking the specificity required for effective military operations.

Thus, military aircraft are uniquely suited to provide a single-arc IFF reply, a critical function for maintaining operational effectiveness and safety in complex airspaces.