system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are criminal cases in the military processed in military courts instead of public courts despite the military being funded by taxes?
gpt
It's ultimately because the military has many laws that are specific to the military; sedition, mutiny, and failure to obey a lawful order being just a few of them. These aren't civilian crimes, so the military needs legal authority to prosecute these charges. 

In the event that a servicemember commits a typical crime, let's say getting drunk and assaulting someone, the civilian legal system will get together with the military legal system and determine in which court to prosecute (typically it will end up in the civilian court if the crime was not committed on a military installation). When the crime is committed off-base, the city/county has jurisdiction. They can then choose to hand over jurisdiction to the military, or they can maintain jurisdiction and prosecute normally.