Measurement and Signature Intelligence (MASINT) is defined as intelligence data other than imagery and signals intelligence that locates, identifies, or describes distinctive characteristics of targets.

• A. Imagery Intelligence (IMINT)
• B. Signals Intelligence (SIGINT)
• C. Measurement and Signature Intelligence (MASINT)
• D. Human Intelligence (HUMINT)

Answer: (C)

The main idea is distinguishing MASINT from other intelligence disciplines by focusing on data that measure and describe distinctive characteristics of targets, rather than capturing images or intercepting signals. MASINT relies on sensors that quantify physical phenomena—like chemical signatures, thermal and radar signatures, radiation, seismic or acoustic data, and material analyses—to locate or identify targets. The definition specifically points to intelligence data that is not imagery or signals intelligence, yet still serves to characterize targets, which is exactly what MASINT does through measurements and signatures. Imagery intelligence focuses on pictures and visuals, while signals intelligence deals with intercepted communications and electronic signals, and human intelligence comes from people. Therefore, this option best fits as MASINT.