An F-35A performs a strafing run in Arizona on Oct. 26, 2023. Deliveries of the newest F-35s have been stalled for months due to software problems with a key upgrade known as Technology Refresh 3.

If you take a look at your laptop's keyboard, you'll notice that the top row keys have icons printed above, with "F" and a number, like F1, F2, and so on, below each one. These are known as function ...