Recently, disaster scenarios and terrorist attacks have made apparent some fundamental shortcomings in first responders' conventional coordination infrastructures. For example, unsatisfactory device connectivity, and security vulnerabilities made manifest by devices' inherently mobile nature, have the potential to seriously compromise first responders' effectiveness. To address these shortcomings, we designed and built Webbee, our secure coordination and communication infrastructure. In this article, we will take a high-level look at Webbee's architecture, and ...