Which statement best defines reconnaissance?

• A. A system of passive observation of activities.
• B. A mission undertaken to obtain, by visual observation or other detection methods, information about the activities and resources of an adversary, or to secure data concerning the meteorological, hydrographic, or geographic characteristics of a particular area. (AGGRESSIVE)
• C. A plan to protect forces from chemical, biological, radiological, and nuclear threats.
• D. A type of aerial photography.

Answer: (B)

Reconnaissance is an information-gathering mission that seeks to learn what an enemy is doing and what resources they have, as well as key environmental features of the area, using visual observation or other detection methods. It is purposeful and designed to gather actionable data to support planning and decision-making, including both activities and resources of adversaries and the meteorological, hydrographic, or geographic characteristics of a location.

This broader definition goes beyond simply watching something passively or focusing on one method. The other statements are narrower or describe a different concept: passive observation lacks the intentional, information-focused aim; a plan to protect against chemical, biological, radiological, and nuclear threats is about defense, not gathering intelligence; and restricting reconnaissance to aerial photography overlooks the range of methods and the broader information goal.