"Nur Ali Shushkari, the head of the Revolutionary Guards ground forces, told Iranian pro-government news agencies that the symbol was etched onto the ship by the crew of a submarine that had managed to reach the U.S. vessel without detection by radar." - Yossi Melman And exactly why would a Kilo boat operating in the Persian Gulf be required to expose it's self to radar? Run silent, run deep, swim the frog men out and let them do their thing. This is NOT new stuff folks, it has been done for much of a century. Why can't folks understand that?
from the article: Iran Revolutionary Guards: Unit engraved emblem on U.S. ship