principal, understand a principal's level of vulnerability to any given threat, and use available intelligence to mitigate threats and/or risk to a principal. The Protective Intelligence Unit works extensively with the U.S. Secret Service, Pentagon Force Protection Agency, U.S. Army Criminal Investigation Division, Department of the Air Force Office of Special Investigations, and the U.S. Marshals Service. Multiple Threat Alert Center The Multiple Threat Alert Center (MTAC) utilizes NCIS' worldwide presence and combination of law enforcement, counterintelligence, intelligence and security capabilities to identify a wide range of threats to Navy and Marine Corps personnel and assets around the world. The MTAC is a unique platform in that it merges intelligence from other agencies with information from NCIS source networks and law enforcement activities worldwide to provide the most relevant operational support to Navy and Marine Corps commanders. Regional Enforcement Action Capabilities Training team In 2014, in the aftermath of the Washington Navy Yard shooting, NCIS formed the Regional Enforcement Action Capabilities Training (REACT) team. REACT teams are designed to support investigations and "high-risk" enforcement operations within the United States, including high-risk operations that involve the service of arrest and search warrants, undercover agent and source protection/rescue, undercover operations, high-risk surveillance, and high-risk protective assignments. REACT team is organized, equipped, directed, and controlled by the deputy assistant director, Criminal Investigations and Operations Department, Criminal Operations Directorate, and is under the direction of the REACT commander and deputy commander. Because of NCIS' changing needs and mobility, realignments of field offices, and geographical differences, the composition of each team may vary. In general, each REACT team will be composed of one team leader (TL), one assistant team leader (ATL), and multiple tactical operators. Assignment to REACT is strictly voluntary and REACT is classified as a collateral duty, meaning Special Agents assigned to REACT remain in their original assignments within the field office when not called into service with REACT. If REACT assistance is determined to be necessary, the field office SAC or his/her designee will contact the REACT commander, or deputy commander if the commander is unavailable, for further discussion and evaluation. The deputy assistant director of criminal investigations and operations maintains final approval authority for the use of REACT and the execution of a proposed operation. Major Case Response Team The Major Case Response Team (MCRT) is tasked with processing crime scenes and collecting evidence. They collect fingerprints and biological trace, impression,