A pirate riddle is:
   
Q: What do you call a communist pirate ship?
A: The USS-ARRR.
   
The “USS”/“USSR” pun was posted on Reddit—Jokes on May 7, 2014.
 
         
Wikipedia: United States Ship
United States Ship (abbreviated as USS or U.S.S.) is a ship prefix used to identify a commissioned ship of the United States Navy and applies to a ship only while it is in commission.
 
Soviet Union
The Soviet Union (Russian: Сове́тский Сою́з, tr. Sovétsky Soyúz, IPA: [sɐˈvʲɛt͡skʲɪj sɐˈjus]), officially the Union of Soviet Socialist Republics (Russian: Сою́з Сове́тских Социалисти́ческих Респу́блик, tr. Soyúz Sovétskikh Sotsialistícheskikh Respúblik, IPA: [sɐˈjus sɐˈvʲɛtskʲɪx sətsɨəlʲɪsˈtʲitɕɪskʲɪx rʲɪˈspublʲɪk]), abbreviated as the USSR (Russian: СССР, tr. SSSR), was a socialist state in Eurasia that existed from 1922 to 1991.
   
Reddit—Jokes
What do you call a communist pirate ship?
submitted May 7, 2014 by Balls123456789
The USS Arrrrrr
           
Twitter
virtualras
@ImSuchAJokester
What do you call a communist pirate ship?... The USS Arrrrrr
8:27 AM - 10 May 2014
 
Twitter
nick froehlich
@NickSFroehlich
As mandated by the masses:
What do you call a communist pirate ship?
The USS Arrrrrr
Invest in the best.
10:50 AM - 13 Nov 2016
 
Reddit—Jokes
What’s a communist pirates favourite holiday destination?
submitted August 21, 2017 by comeonman123456
The U.S.S. Arrrghhh
 
Reddit—Jokes
Where is a communist pirate from?
submitted February 21, 2018 by fliute
The USSAARRR
 
Reddit—Jokes
What do you call a communist pirate ship?
submitted April 25, 2018 by Inexorability23
The USS-ARRR