system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Do less advanced ships get decommissioned or demoted to lower duties?

When ships like the Enterprise, and the other equal ranked front line ships, go from using Galaxy Class to Sovereign, do the second line ships get the now old Galaxies, and so on down the line, or do those ships get decommissioned?

Basically, is there somewhere out in the galaxy a very old former Enterprise or Excelsior doing boring patrols, or do they chop them up?
gpt
Starfleet keeps ships in service unless there's a big enough reason to decommission them, such as being severely outdated past any real usefulness (such as the *NX*\-class ships).

*Excelsior*\-class and *Miranda*\-class ships, for example, were introduced into service when James T. Kirk was a Starfleet Admiral. They were still in service when the Dominion War broke out, over a century later.