NCIS Dodge Charger is a car that the NCIS Major Case Response Team led by NCIS Special Agent Leroy Jethro Gibbs currently use.
Their counterparts, the
Office of Special Projects in Los Angeles also use the Dodge Charger as a method of transport whenever they need to get a crime scene or if they're chasing after a possible suspect.
Prior to the Dodge Charger, NCIS used both the
NCIS Dodge Intrepid and the NCIS Dodge Stratus before switching to the Charger.
Presumably, at the start of Season 9, Gibbs's team began using the Dodge Charger, replacing the Dodge Stratus they had used beforehand.