A device, system and method for generating and rendering customized application data for first responders is provided. A device receives an assignment identifier and input to access a web-based application using a link and a browser application. The device incorporates the assignment identifier into the link to generate a customized link and launches the browser application using the customized link to retrieve customized application data indicative of the web-based application customized according to the assignment identifier. The device controls a display screen to render the customized application data in the browser application. A server receives the customized link from the device, generates the customized application data, indicative of the web-based application customized according to the assignment identifier, and transmits the customized application data to the device.