You may be misremembering the 2nd amendment:
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
It doesn’t say anything about the government being prohibited from using force against citizens. It’s about citizens being able to have firearms (arguably, with the caveat that they’re part of a militia, but that’s a whole other discussion).
USS Pete Hegseth, a US Navy garbage scow