An item reported that on 6 June 1955 on the Danube off Cernavoda 3 Romanian river monitors and a number of smaller vessels were sighted executing training exercises.
Source
The report was published on www.archive.org, document number CIA-RDP80-00810A008000610003-6
Source
The report was published on www.archive.org, document number CIA-RDP80-00810A008000610003-6