I suppose this Lockheed Viking can now be considered "civil" by some?
https://www.thedrive.com/the-war-zone/4 ... the-sunset
https://www.avweb.com/aviation-news/nas ... 3b-viking/
https://www.nasa.gov/feature/glenn/2021 ... -its-fleet
The history of this particular Lockheed airframe:
https://www.avgeekery.com/nasa-601-the- ... t-vikings/
Today the last Viking built wears registration number N601NA and NASA tail number 601.
Since then the remaining “War Hoover” S-3B Vikings in Naval service have all been retired- the last of them in 2016.
N601NA is literally the very last S-3B Viking.
BuNo 160607/N601NA may be the only aircraft that was both the last one of its kind built and the last one of its kind to be airworthy.