When you ride DC metro, the ads you see aren’t predominantly for consumer products. Most people riding the metro can’t afford to buy weapons systems, but you see ads for jet fighters anyway. The most expensive subway ads are in the Pentagon station and inside Capital South. They’re targeting very expensive ads to very narrow audiences: Defense Department procurement officers, and Congressional staff on just the right committee.
Since government bureaucrats can use their power to reward friends, to secure themselves future employment, or simply take kickbacks, there are a whole set of regulations constraining how government contracts should be awarded. Usually they have to go to the lowest bidder, but there are rules for selecting a higher cost bidder. Were those rules followed to the letter?