National Threat Assessment Command

The National Threat Assessment Command (NTAC) was a division of the Department of Homeland Security and played a pivotal role in the USA Network television series The 4400. One branch of NTAC was located in the Seattle, Washington area and was headed up by Home Sec administrator Dennis Ryland. In 2004, 4,400 abductees were mysteriously returned to Earth at the base of Mount Rainier. NTAC was charged with quarantining the returnees (who were colloquially referred to as the 4400) and working in cooperation with the CDC to make sure that they were not carrying any communicable diseases. The section chief of the Seattle office was Agent Dennis Ryland. After six weeks of quarantine, NTAC began releasing the 4400 back into the civilian population. Each of the returnees were required to appear at an NTAC center once a week to check in.

When the returnees began demonstrating bizarre superhuman abilities, NTAC assigned two agents to investigate these cases: Former Home Sec agent Tom Baldwin and CDC analyst Diana Skouris.