Every single defence company today is the result of decades of mergers and decades of Cold War peak defence budgets. Not even SoftBanknhas that amount of dough to repeat that.

Lockheed Martin used to be Lockheed and Martin, MDD used to be McDonnel and Douglas, Northrop Gruman, well, you get it. Those companies were built, the were merged. And they are the first on the big defence budgets, and honestly also the only ones being able to deliver modern defence and weapon systems (regardless of delays and cost over runs).