The Military could not support this nonsense. Cutting off all access to the internet would kill pretty much every common communication tool with a range greater than say, 300 miles. No real-time maps, no up-to-date cross-system references, no tech manuals, no access to personell files, no MRC chat, limited ways to coordinate air-strikes between services...it would turn the entire DOD on its damn head. The pentagon would just an especially ugly building.
And then we have the wonder parts that would allow the government to request information from any company that uses the internet as part of its business model...without justification. For shits and giggles, if you will.