First Look: Inside NCIS' 300th Episode

Abby shows off her new Caf-Pow helmet.

Abby shows off her new Caf-Pow helmet.

On NCIS's 300th episode, "Scope" (Season 13, Episode 17), the team re-examines an ambush on a group of Special Ops snipers in Iraq after an American couple is attacked in the same area six months later. When Gibbs discovers he needs the account of the lone survivor, Marine Gunnery Sergeant Aaron Davis (Taye Diggs), he tries to connect with the wounded warrior who is being treated for PTSS at Walter Reed Medical Center. 
A wounded warrior takes the mic.

A wounded warrior takes the mic.

"Scope" (Season 13, Episode 17 of NCIS)
A MusiCorps performer jams on the guitar.

A MusiCorps performer jams on the guitar.

"Scope" (Season 13, Episode 17 of NCIS)
Marine Gunnery Sergeant Aaron Davis walks through the Walter Reed Medical Center.

Marine Gunnery Sergeant Aaron Davis walks through the Walter Reed Medical Center.

"Scope" (Season 13, Episode 17 of NCIS)
Dr. Grace Confalone shows Gibbs around the Walter Reed Medical Center.

Dr. Grace Confalone shows Gibbs around the Walter Reed Medical Center.

"Scope" (Season 13, Episode 17 of NCIS)
The MusiCorps band practices.

The MusiCorps band practices.

"Scope" (Season 13, Episode 17 of NCIS)
Marine Gunnery Sergeant Aaron Davis reflects on the past.

Marine Gunnery Sergeant Aaron Davis reflects on the past.

"Scope" (Season 13, Episode 17 of NCIS)
The MusiCorps band comes together.

The MusiCorps band comes together.

"Scope" (Season 13, Episode 17 of NCIS)
Marine Gunnery Sergeant Aaron Davis notices Gibbs.

Marine Gunnery Sergeant Aaron Davis notices Gibbs.

"Scope" (Season 13, Episode 17 of NCIS)