U.S. Customs Officer was a man who was on board the unnamed Turkish ship in the aftermath of the explosion that left NCIS Special Agent Leroy Jethro Gibbs badly injured and also in a coma. When NCIS/Mossad Liaison Officer Ziva David stomped on a cigar that the ship's captain, Aris Mahir, had been smoking, the two exchanged insults in Turkish which drew some amusement from the Customs Officer, hinting that he might know or be in fluent in Turkish.