Money
Gonna keep saying this till it sinks in, they've been given a huge budget, they need to spend it inside USA on new projects.
It's not even real money, it's 'cyber' money created by the treasury, that amount to fabricating money from thin air. That money needs to be pumped into new things inside the USA to inflate the USA GDP.
US GDP growth is 2.2%, including oil, housing, food etc.
US Inflation is 2.85%, really reduced by removing oil, housing, food from the number and scaling the rest by a feel good factor, real number is estimated at 15%+.
US Money supply growth is no longer disclosed, it's estimated M3 is growing at 18%+
i.e. money is growing at 9 times faster than the growth supports and that's driving up inflation, and driving down the dollar, which they need to buy oil which means they need to make more dollars to pay for the oil that .... /loop.
They're making new money to pay for their oil, which is costing them $500 billion a year now plus the deficit, plus the interest on the deficit plus the rest. They're not making the money by selling things because they're running at a huge trade deficit.
So they'd need to create a huge domestic growth boom (bigger than China) to back up that money they're printing. That's why they're trying desperately to find new things that they can do in the USA with this money they're printing. A cyber-pentagon is perfect for that, it's new (largely because it's pointless), would be staffed by Americans (hence increase GDP rather than China's GDP) and pentagon projects are huge money sinks (Pentagon has a trillion $ budget, that's TEN TIMES larger than Iraq's GDP) .
So you see they're dead in the water here, they're funding expanded military because the growth in military budget *IS* their internal GDP growth. It *is* their engine of growth, and by making pointless busy work it lets them inflate their GDP.
Why do you think the conversation changed from their debt as a fraction of their net exports to their debt as a fraction of their GDP? It's because they're exports went negative, so they could no longer fund their debt by making and selling stuff.
Quite simply they don't make a profit making and selling stuff so they don't make money to pay for the oil they're buying in. If a company did this, it would be selling more shares, calling that money 'income' then reporting it on their balance sheet as profits. Enron was the biggest company in the world, just before it collapsed, it was a spectacular failure because it covered up the bad numbers.