What does time-to-engagement (TTE) refer to?

• A. The time from target detection to weapons launch to achieve a successful intercept.
• B. The time required to replace a sensor.
• C. The time to re-task a unit.
• D. The time to disarm.

Answer: (A)

Time-to-engagement is the duration from when a target is first detected by the air defense sensors to when the interceptor is launched to achieve an intercept. It captures the full engagement decision cycle—sensor detection, data fusion and tracking, engagement authority, and weapons launch. This window is critical because fast-moving threats give you only a short opportunity to intercept, so the quicker the detection-to-launch process, the higher the chance of a successful intercept. Actions like replacing a sensor, re-tasking a unit, or disarming fall outside this engagement window and do not define TTE.