Hail & Farewell is the 20th episode of NCIS Season 16 and also the 374th episode of the entire NCIS series.
NCIS investigates the murder of a Marine Major believed to have been killed in the 9/11 attack on the Pentagon after human remains are discovered at a construction site with a personal history with the victim soon driving Gibbs to solve her crime.
- Gibbs is revealed to have been engaged to Major Wallace at some point before her death, an engagement he ultimately broke off due to feeling it was better off for her if she didn't marry him in the long run.
- Gibbs is also revealed to have felt guilty since he did not answer the phone in what was ultimately her last call to him.
- McGee invokes Rule 10 and removes Gibbs from the case briefly, when his relationship becomes a focus of the case.
- This episode shares its title with two episodes of JAG, Hail and Farewell Part 1 which was the JAG Season 8 finale episode and Hail and Farewell Part 2 which was the JAG Season 9 premiere episode.
|Leroy Jethro Gibbs||Mark Harmon||Special Agent in charge of the NCIS Major Case Response Team.|
|Timothy McGee||Sean Murray||Senior Special Agent and second-in command of the NCIS Major Case Response Team.|
|Nicholas Torres||Wilmer Valderrama||Special Agent for the NCIS Major Case Response Team.|
|Eleanor Bishop||Emily Wickersham||Special Agent for the NCIS Major Case Response Team.|
|Jacqueline Sloane||Maria Bello||NCIS Forensic Psychologist.|
|James Palmer||Brian Dietzen||Medical Examiner for the Major Case Response Team.|
|Kasie Hines||Diona Reasonover||NCIS Forensic Specialist; Abby's replacement.|
|Leon Vance||Rocky Carroll||Director of NCIS. Despite being credited, Carroll doesn't appear in this episode.|
|Donald Mallard||David McCallum||NCIS Historian. Despite being credited, McCallum doesn't appear in this episode.|
|James Wallace||Garrett M. Brown||Retired Marine General and victim's father.|
|Daniel Kent||Doug Savant||Marine Brigadier General.|
|Ellen Wallace||Erin Cummings||Marine Major and murder victim, supposedly killed in 9/11 and Gibbs's ex-fiancée.|
|Amy Tano||Cassandra Creech|
|Franklin Morrison||Andrew Bilgore|
|Omar Lewis||J. Teddy Garces|
|Taylor Southard||JJ Hawkins||DOD Cyber Engineer.|
|Unnamed ZNN Newscaster||Danielle Demski||ZNN Newscaster.|
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