Reuters.com said:

However, those long-standing contractors, such as Northrop Grumman, (NOC.N), opens new tab Boeing (BA.N), opens new tab and RTX (RTX.N), opens new tab are expected to be big players in the process as well, people familiar with the companies said. Lockheed Martin (LMT.N), opens new tab put up a webpage as a part of its marketing efforts.

 

https://www.reuters.com/business/aerospace-defense/musks-spacex-is-frontrunner-build-trumps-golden-dome-missile-shield-2025-04-17/