The military cares about reliability. Emissions systems on modern heavy duty civilian trucks are hell on reliability.

There's a reason many people owning diesel trucks in states that don't do emissions testing pay a lot of money to delete the systems after purchase.

That's worse than pay-to-play.

I lived in a tourist-driven coastal town for a few years, builders there regularly paid off our corrupt mayor to avoid the rules.

When the government is dodging its own rules its "rules for the, not for me."