| ArmaLite | small arms manufacturing company | Geneseo | 1954 |
| Barrett Firearms Manufacturing | organization, business, enterprise | Christiana | 1982 |
| Boeing | rail vehicle manufacturer, public company, aerospace manufacturer | Chicago | 1934 |
| Colt's Manufacturing Company | business, subsidiary company, enterprise | West Hartford | 1855 |
| Curtiss-Wright | holding company, business, public company, aerospace manufacturer | Charlotte | 1929 |
| Fairchild | aerospace manufacturer | — | 1925 |
| Hughes Aircraft Company | aerospace manufacturer | Culver City, Los Angeles | 1932 |
| Kahr Arms | business | Pike County | 1995 |
| Knight's Armament Company | business, enterprise | Titusville | 1983 |
| Lockheed Martin | defense contractor, public company | Bethesda | 1995 |
| Magpul | business | — | — |
| Martin Marietta | business, enterprise | Bethesda | 1961 |
| McDonnell Aircraft Corporation | aerospace manufacturer | St. Louis | July 6, 1939 |
| McDonnell Douglas | former entity, defense contractor, aerospace manufacturer | St. Louis | 1967 |
| Northrop Grumman Corporation | defense contractor, public company, aerospace manufacturer | Falls Church | 1994 |
| O.F. Mossberg & Sons | business, enterprise | North Haven | 1919 |
| RTX | defense contractor, business, public company | Arlington County | April 3, 2020 |
| Springfield Armory | business | Geneseo | 1974 |
| Vought | aerospace manufacturer | Dallas | 1917 |
| Winchester Repeating Arms Company | business, enterprise | New Haven | 1866 |