Basic Army Knowledge Practice Test 2026 - Complete Study Guide

The sequence in the 5 Cs guides responders through a safe, time-ordered response to suspected UXO. After you have confirmed there is a suspected ordnance, you move to clearing the area of people, then you call in the appropriate experts. The fourth action is to cordon off the area, establishing a clear, physical boundary with barriers or tape to prevent entry and keep the scene intact for professionals to assess and handle the situation. This step is essential because it immediately reduces risk to bystanders and preserves the site for safe handling by EOD teams. The earlier steps—confirming and clearing—happen before cordon, and the earlier "call" step precedes the boundary in this sequence, which is why cordon is the fourth.