Trivia: In the scene where Ziva and Tony board the British ship, the scene cuts to the exterior shot of the British ship and shows the ship flying the Union Jack flag. Unfortunately the ship is a United States Navy AEGIS Destroyer and although the British are Allies, none of the AEGIS ships have been sold to the British Navy.
Trivia: The titles of the season 8 episodes "Enemies Foreign" and "Enemies Domestic" are references to the Presidential oath and the oath taken by members of the military to defend the Constitution.
Answer: I hadn't seen the backdoor pilots yet but while it wasn't explicitly stated, at least onscreen, I heard somewhere Vivian got either fired from NCIS due to jeopardizing a case, got resigned from the agency, or transferred to the FBI.
Raykvega423