Which of the following is a type of ACINT report?

• A. Nine-line report
• B. Acoustic telemetry log
• C. Towed Array Contact report from unit in contact
• D. Weather and sea state update

Answer: (C)

ACINT focuses on underwater acoustic observations and the details needed to understand and track acoustic contacts. A report of a contact detected by a towed array from the unit in contact is exactly the kind of information ACINT communicates: time, bearing, range, course and speed if available, depth, and the acoustic characteristics that help analysts identify submarines or other sound sources. This makes it a true ACINT product because it directly conveys an underwater audible observation for intelligence assessment and fusion with other sensors.

The other options don’t fit as ACINT reports. A nine-line format is a general reporting structure used in various operations, not specifically an acoustic intelligence report. An acoustic telemetry log is more of a data record of telemetry signals rather than a formal ACINT observation intended for intelligence analysis. Weather and sea state updates are environmental reports, not acoustic observations.