2026 | COMPLETE STUDY GUIDE &
PRACTICE QUESTIONS
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Updated 2026 Questions and Answers
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Rationales Included
, Four critical sources for gathering intelligence Human, signals, image, and Open source Intelligence
human intelligence Intelligence gathered by means of interpersonal contact
O RED Orientation, research, exploitation, dissemination - Intelligence cycle (Human
Intelligence)
Signal Intelligence Intelligence that has been collected by technological resources. Also referred
to as SIGINT.
Lead of Signal Intelligence National Security Agency, lead agency for collecting signals; NSA responsible
for providing foreign signals intelligence
Imagery (IMINT Representation of objects reproduced on cameras, or other media. Also
includes photos, sensors, infrared sensors, lasers and electro optics