MTAC is the acronym for Multiple Threat Assessment Center
Mary Page Keller plays three different characters within the same universe. Here she plays Lt. Cmdr Michaela 'Micki' Shields, On JAG (1995) (which is where NCIS originated as a back door pilot), she plays Cmdr. Beth O'Neil in three episodes, and on NCIS: Los Angeles (2009) she plays Angela Tully.
Gibbs says the name of the episode, "Terminal Leave", when talking to Reyes near the destroyed SUV