Which AE category or categories require either an intrusion detection system (IDS) or nearby armed guards?

The category of Ammunition and Explosives (AE) requiring either an intrusion detection system (IDS) or nearby armed guards is indeed categorized under CAT I and CAT II. These categories typically include the most sensitive types of ammunition and explosives, where the risk of theft, misuse, or unauthorized access is particularly high.

For CAT I, which generally encompasses the highest-risk explosives and munitions, stringent security measures are essential. An IDS serves to detect unauthorized access attempts, while the presence of armed guards acts as a deterrent against potential threats.

Similarly, CAT II includes critical materials that may not be as hazardous as those in CAT I but still carry significant risks. These materials are safeguarded with the same rigorous measures to ensure their protection, demanding a strong physical security posture.

The other categories, such as CAT III and CAT IV, involve lower-risk materials, for which the security protocols may not require both armed guards and IDS to the same extent. Thus, CAT I and CAT II being the correct categories underscores the importance of high-level security in handling more dangerous AE assets.