I monitored an excersize this morning which included the Missouri Air National Guard, Missouri and Kansas Highway Patrols, Doniphan County Kansas, and Buchanan County Missouri sheriffs depts. It was done through the Buchanan County Missouri Digital trunk. It was a training excersize in preparation for an up coming air show at Rosecrans Memorial Airport. The majority of the traffic was on the trunk, although there was some vhf traffic on 155.475. It was the first time I was aware that the Kansas Digital system could make direct contact with our Digital trunk in Buchanan County. It was an impressive demonstration of interoperability between agencies. I guess I know why there was testing earlier this month!