S9·E24 Till Death Do Us Part

Episode recap

Task: Write a 280-380 word episode recap for NCIS S9E24 ("Till Death Do Us Part").
Constraints:
Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
Do not invent/guess titles, names, dates, counts, awards, ratings, etc.
If a detail is not in the material, omit it.
Write original, neutral, encyclopedic prose in plain text.
No markdown, no asterisks, no headings, no bullet points.
Word count target: 280-380 words.
Synopsis (TMDB): "Terrorism shakes the foundations of the Navy and NCIS to such an extent that Gibbs and the team face surprises that will devastate them."
Source [1] (TMDB): Series is NCIS (2003), TV-14, Crime, Drama, Action & Adventure. Overview mentions murder, espionage, terrorism, and stolen submarines.
Source [2] (IMDb): Created by Donald P. Bellisario and Don McGill. Stars Sean Murray, David McCallum, Mark Harmon, Brian Dietzen. Follows the Major Case Response Team of the NCIS investigating criminal cases connected to the US Navy and Marines Corps personnel and their families.
Source [3] (Deadline): Mentions NCIS originated as two back-door pilot episodes of JAG in April 2003. Mentions Pauley Perrette's audition for Abby.
Source [4] (Variety): Mentions Sean Murray and Brian Dietzen were recurring in Season 1 before becoming regulars. Rocky Carroll joined in Season 5.
Source [5] (Wikipedia): American military police procedural. Showrunner is Steven D. Binder. Portrays a fictional team of special agents from the Naval Criminal Investigative Service (NCIS).
Episode Title: "Till Death Do Us Part" (S9E24).
Plot: Terrorism shakes the foundations of the Navy and NCIS. Gibbs and the team face surprises that will devastate them.
Series context: NCIS is an American military police procedural created by Donald P. Bellisario and Don McGill. It follows the Major Case Response Team of the NCIS as they investigate criminal cases connected to the US Navy and Marines Corps personnel and their families. The series features characters such as Gibbs, played by Mark Harmon, and includes actors Sean Murray, David McCallum, and Brian Dietzen.
The synopsis is extremely brief: "Terrorism shakes the foundations of the Navy and NCIS to such an extent that Gibbs and the team face surprises that will devastate them."
The word count requirement is 280-380 words.
Problem: I cannot invent