What security feature is installed at all major passenger terminals linking security forces?

The duress alarm system is a critical security feature installed at all major passenger terminals specifically to link security forces in situations where a rapid response is necessary. This system allows authorized personnel to silently alert law enforcement and security staff if they are in distress or if there is a security breach. The effectiveness of a duress alarm lies in its ability to communicate emergencies without alarming any potential perpetrators, facilitating a swift and coordinated response to ensure passenger safety.

It's important to consider the roles of other options as well. The fire alarm system is key for fire safety and alerting occupants of fire hazards but does not directly connect security forces during criminal or safety incidents. An access control system manages entry to secure areas but does not specifically provide a means for emergency communication in tense situations. The passenger screening system is vital for ensuring that passengers do not carry prohibited items but, like the others, does not serve as a direct communication tool for security forces during emergencies. Therefore, the duress alarm system stands out in terms of enhancing the connectivity and responsiveness of security forces in passenger terminals.