Where are the three marking locations inside of a search or survey site?

The correct answer emphasizes the importance of marking locations in a way that enhances safety and situational awareness during CBRN reconnaissance operations. Marking the door, the side of the door, and the floor in front of the door establishes key reference points that are crucial for both the team conducting the survey and for other units that may follow. This systematic approach facilitates effective communication of potential hazards, access points, and navigational aids, which are vital in an environment where visibility may be compromised due to contaminants or other factors.

By identifying these specific areas, teams can ensure they are always oriented correctly when entering or exiting the building, and they can alert others to the conditions present upon entry. Effective marking also aids in situational debriefing and operational planning by providing clear indicators of areas that have been surveyed and those that require further attention.