This appointment is not out of the blue.
Tom Bossert, who has been named to be the president's homeland security adviser appears, to know "which end is up" when it comes to homeland security and emergency management. If you look at the link above, it gives a brief work history. In particular I like the fact that he has worked at the Federal Emergency Management Agency (FEMA) and the Small Business Administration (SBA). One stint with Homeland Security also included leading the Infrastructure Protection efforts for the department. The fact that he brings cybersecurity credentials is another positive.
Here is a news story Trump names Thomas Bossert homeland security adviser that also states that they are splitting the Homeland Security function out from under the national security adviser, which is something that I also like. When both functions are combined, the top boss is going to focus on the side where the bread is buttered, and that is on national security from an international perspective.
This CNN story provides additional details and also a status and list of Trump's cabinet picks.
Overall, this is a bright spot in the appointments I've heard to date.
Diane Newman shared the information on the appointment.