It could go that way Elee but the US could never outsource the whole lot because many companies are also arms manufacturers and there would be some overlap in technologies and engineering between military and civilian applications.
The worlds top eight arms manufacturers listed in order of the value of their arms sales:
1. Lockheed Martin US 2. Boeing US 3. BAE Systems UK 4. Raytheon US 5. Northrop Grumman US 6. General Dynamics US 7. Airbus EU 8. United Technologies Corporation US