This article from American Security Today covers the needs of First Responders for current Situational Awareness and collaboration.
It touches on several events last year that either ATAK helped at or would have helped if it were used. It also touches on the use of ATAK by DHS and how TAK is transferred to private companies. There are a total of four videos in this article.
Here’s the video of Jeff Flake talking about the Congressional Baseball practice, which I hadn’t seen before.