It’s expensive because it has to go through a dozen layers of private contractors.
The US military was remarkably good at rapidly churning out cheap, effective armorments during the WW and early Cold War era. But the LBJ/Nixon pivot to private industry eroded all the efficiency. Then Reagan kicked military spending into overdrive in the 80s, and it’s been a snowball of waste, fraud, and embezzlement ever since.
Now the model for military procurement is just a jobs program for Congressional districts. The epitome of the Do Nothing profession.
It’s a big bureaucracy and procurement often just means going to the private sector and scooping up what’s on sale.
Non-zero chance the Koreans are running around with explosive pagers in their pockets right now.