TNT has cancelled The Last Ship after Season 5, as leaked by actor Travis Van Winkle.
“After five years, that’s a wrap on The Last Ship. An experience that taught me so much about being a man[..] To the cast.. I love you. To the crew.. I love you. To the writers/producers.. I love you. Danny Green.. Thanks for the memories. Signing out.”
However, offering (false?) hope to fans, TNT made some attempt to refute the proactive cancellation, per TVLine:
“We shot two seasons simultaneously; the fourth is currently on the air and the fifth will return next summer. We greenlit the fifth with the idea that it could be the final season, however it’s far too early to make that determination.”