Software is a common skill, especially among military-age men. Probably around 5% of those employed in that group have software-related jobs. Doctors are rarer,

Software is a common skill, especially among military-age men. Probably around 5% of those employed in that group have software-related jobs. Doctors are rarer, and they also need more training to become productive, which makes them harder to replace than software developers. You can argue that a specific individual has specific skills and experience that make them more valuable to the country in a non-fighting role. But software developer is just another common job.