Defense Department procurement weenies insist that all military electronics be built with MilSpec semiconductors. Which cost ten times as much as commercial semiconductors. Are MilSpec semiconductors better than commercial semiconductors? No.
Many years ago I was on the design team for the anti ballistic missile radar at Raytheon. We were doing a big phased array radar for Mech Island in the Pacific. The contract called for a "brassboard" radar to be built and tested at the factory, and a second "deliverable" radar to go to Mech Island. To save money we built the "brassboard" using commercial semiconductors. We got the brass board working, and past the government acceptance tests. Then we started construction of the deliverable. Same circuit boards, same technicians, in the same shops, to the same drawings but all the semiconductors were MilSpec instead of commercial.
The deliverable didn't work. Argh. Trouble shooting revealed that the MilSpec semiconductors had lower gain, higher leakage, and could not withstand as much voltage as the commercial devices. It was so bad that we had to redesign some of the circuits to make them perform when built with lower quality MilSpec transistors.
Not only were the MilSpec devices lower performance, they had a lot of duds. I can remember going thru a brand new box of JAN2N5109TX transistors with a Simpson 260 meter and finding one in ten devices didn't work at all. That's 10 percent duds. For this we paid ten times the price of good commercial parts.
And, turns out, a fair number of MilSpec devices are counterfeit. The scammer buys good commercial parts, wipes off the commercial marking with solvent, and repaints the devices with the JAN-TX markings. Presto, chango, we turn honest commercial devices into pricey MilSpec devices. Several cases of this made the news over the years. In the last case, the defense department admitted that the counterfeit devices were as good as MilSpec and they had no intention of recalling the equipment (some of which was in outer space in satellites) to replace the counterfeits.
We could save defense money by scrapping the whole MilSpec semiconductor "thing" (boondoggle actually). Semiconductors never wear out. If the system powers up and runs and makes it thru high and low temperature testing, the semiconductors are good and will last forever.
It ain't like it was with vacuum tubes.