Which of the following is NOT one of the fundamental principles of reconnaissance?

The principle of conducting reconnaissance is centered on gathering timely and accurate information to aid decision-making. Among the options presented, conducting reconnaissance in reserves does not align with the fundamental principles that emphasize constant engagement and adaptability in the field.

Reconnaissance is primarily about maintaining enemy contact, ensuring that information is reported quickly and accurately, and developing the situation as it evolves. These principles are vital for effective mission planning and execution. In contrast, conducting reconnaissance in reserves suggests a passive approach, which contradicts the active pursuit of intelligence that is necessary in reconnaissance operations. This approach could lead to missed opportunities for critical information gathering and slower response times to changing situations on the battlefield.

Thus, the notion of conducting reconnaissance in reserves fails to meet the foundational purpose of reconnaissance, which is to provide immediate and relevant data on the enemy's positions and intentions.