By changing this Flag parameter you can change nationality of the ship. The model would fly the colors of the country which correspond to values 1.2.3 etc. Try it. Historically, after 09.43 some Gabbiano corvettes were taken over by Kriegsmarine and became German T class, after the war some became French, others - Soviet ships (WW2 reparations). It's one of the great features of SH2/DC - customization.
Hey, ask Mountbatten, should he have time he can do magnificent repaints the ships. He could make you German T out of Italian Gabbiano