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As public safety leaders and longtime citizens of cities directly impacted on Sept. 11, 2001., frontline workers’ responses deeply affected us. What happened that day continues to inform our approach to public safety and inspires us to work harder.

Twenty years ago, the frontline workers who responded to the horrific attacks in New York, Washington D.C. and Pennsylvania were unable to share a simple radio message and communications networks were overwhelmed.

Interoperability — the ability of the frontline to communicate with each other even if they use different telecom carriers — is critical to allow them to do their jobs safely and effectively and keep Americans safe. It allows first responders to coordinate their actions with full situational awareness of what is happening around them…