A gigantic new ICBM will take US nuclear missiles out of the Cold War-era but add 21st-century risks::A new nuclear missile is coming, a gigantic ICBM called the Sentinel. It marks the largest cultural shift in 60 years in the land leg of the Air Force’s nuclear missile mission.
To your AOC edit, the kind of thing I believe she is referring to are secret projects like USAF Project 1794 that could involve modern contractors like Boeing and Lockheed Martin.