Eric Walker added a number of topics and Lessons from the Littoral Combat Ship - War on the Rocks and '$640 Toilet Seat' Syndrome Still Plaguing Pentagon | AP News to Defense industry of the United States, and added Defense industry of the United States to United States businesses and organizations and Defense industry in North America

Eric Walker added Northrop YB-49 - Wikipedia and The YB-49 first flew on October 22, 1947. It must have looked like a UFO back then : WeirdWings to Northrop YB-49, and added Northrop YB-49 to Military aircraft and Northrop Corporation

Eric Walker added Northrop YB-49 to Northrop Corporation, and added Northrop Corporation to Defense industry of the United States