ok, but the post in question:
the f-18 is one aircraft that has successfully served multiple services...
Um, OK- If you mean multiple countries sure.
Depends upon your criteria for successful for cross-service use. Lots and lots of a/c over time have served in the various services but the list of them that served with minimal modification is damn short. Anything modern between USAF and USN/USMC you can start with ripping out the a/a refuling system and replacing it with that service's. Not trivial.
In my mind, if you couldn't, in a day, swap the service ID on the a/c and have it full up as an asset (independent of acceptence inspection type stuff) it's not a common platform. IIRC the A-7 was one of the few that had probe and drogue refueling capability at the same time or at least I recall going through Buckley one time and parking next to a Colorado Guard one with the probe out.