In your opinion, what is the biggest breakthrough in the aerospace and defense industry in the past decade?

"There have been endless breakthroughs in our industry; however, I would say the one that excited me the most was the Falcon 9 Full Thrust. It's amazing to me that a partially-reusable launch system is in existence."

"The biggest recent breakthrough in our industry, in my opinion, was the Falcon 9 Full Thrust; however, there are so many from which to choose! May I ask which was your favorite breakthrough as of late?"