RCOH = Refueling & Complex Overhaul
SLEP = Service Life Extension Program.
RCOH - change the fuel in the reactor!
SLEPs are now more “incremental”, and done during PIAs etc (Planned Incremental Availabilities).
Got a young cousin E-5 riding a Perry-class tin can. Perry class are now >25 y.o. many of them, they just did hull survey on a sister ship and found only 1/8" hull metal left in spots. Just "old ship" syndrome. Everything is balky and subpar, they can't keep up. Most of them due to be retired and/or stricken from the lists in 3-5 years. Of course, that's when the Chicoms will start a big fight, and the five remaining class examples will have to carry the entire load after the Chicom sneaky missiles plug the CV's. </sardonic wit>
Actually, they're already obsolete, many have had their Standard launchers removed .... don't accompany CBG's any more, mostly pulling little-ship duty steaming independently in the Arabian Gulf, Caribbean, and so on. Anti-pirate, anti-smuggling duty.
They have the same kind of complaints we were hearing about the last of the WW II DD's, back when I was in, in 1970. Some of the Gearings were only good for 27 kt with a tailwind (so her Engineering Officer said). Power plants held together with string and baling wire. And so on.