system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the military still use bolt/pump action weaponry?

I don't know a whole lot about firearms, but wouldn't it be beneficial to use something that is semi-automatic rather than bolt/pump operated?
gpt
They use the right tool for the right situation. Regular infantry would use a semi-auto rifle, such as an m4, m16, m249. 

Snipers might use a bolt-action because it doesn't have moving parts when being fired. That helps improve accuracy. Occasionally there are situations where they might use a pump action shotgun as well.