Dr. Arati Prabhakar has to be lauded for leading the way US government entities evolve with the times. She had a distinguished leadership tenure at NIST and was responsible for increasing its outreach with industries in my opinion.
Regarding DARPA funding GaN research in RF and power devices, here is a link that lists companies funded:
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.