DHS published a Team Awareness Kit Fact sheet last month that I just noticed. It covers what they’ve been doing for the last couple of years with TAK, and thee dozen or so big event that they’ve used it with.
They point out that:
DHS deploys the Team Awareness Kit (TAK) to support the complex communication and coordination needs of a multi-jurisdictional incident response. TAK is a cost-effective, government off-the-shelf solution developed by the Department of Defense to enable tactical data to be generated, visualized, and shared, facilitating communication across multiple users to achieve shared tactical awareness.
It goes on for another page after that. PDF here.