On May 2, 2018, the South Central Regional SWAT TEAM (CT) assisted the North Haven Police Department with an armed barricaded suspect incident involving a man who had taken his wife hostage for three days. During the progression of the tactical deployment, the suspect initiated a large explosion injuring nine operators, triggering a mass casualty rescue. After the initial explosion, South Central SWAT and on-scene personnel faced additional challenges including continued containment, evacuations, follow-up explosions, and fire exposure to adjoining homes. The incident triggered a mass response from local, state and federal law enforcement agencies that created secondary scene issues. This debrief will outline the advantages and disadvantages pertaining to the SWAT team's structure, and lessons learned during the coordination efforts with mutual aid.