Gibbs and Marcie realize that the killer they've been tracking may be onto them on the season finale of NCIS. "Rule 91" is the 16th episode of the show's 18th season.
Palmer reflects during an NCIS investigation about how members of an NCIS Regional Enforcement Action Capabilities Training Team (REACT) were killed during an explosion.
Kasie explains what she has discovered about how members of an NCIS Regional Enforcement Action Capabilities Training Team (REACT) were killed during an explosion.