The government/DoD does have more money than a billionaire. But they never work out the cost/benefit ratio of the spending.
Wages for 700,000 staff at a miserly $2,000 per month = $1.4 billion per month. But they're only 50% effective due to bad IT.
It's a bigger waste of money to have those 700,000 staff working at 1/2 speed for a few weeks than it is to get new kit.