What is an essential action to take if you encounter MANPADS?

Notifying the FBI and Military Explosive Ordnance Disposal (EOD) is the essential action to take if you encounter a MANPADS (Man-Portable Air-Defense System). These systems pose a significant threat due to their ability to target and destroy aircraft from the ground, and they often require specialized knowledge for safe handling and disarmament. The involvement of federal authorities, particularly the FBI and Military EOD, is crucial because they possess the expertise and resources needed to manage the risks associated with these types of munitions effectively.

Calling for backup support may also be important in terms of ensuring safety and providing additional assistance; however, it does not directly address the immediate need to handle the specific threat posed by the MANPADS. Similarly, approaching the operator cautiously or attempting to disarm the device oneself would not only be highly dangerous but could also compromise evidence or create further risk to oneself and others. Hence, involving the appropriate authorities is the safest and most effective course of action.