Pacific Command and now United States Central Command, it's impossible to make this guy as he likes to say " nervous". The United States Central Command is a theater-level Unified Combatant Command of the U.S. Department of Defense, established in 1983, taking over the 1980 Rapid Deployment Joint Task Force responsibilities. United States Pacific Command is a unified combatant command of the United States armed forces responsible for the Indo-Asia-Pacific region. It is the oldest and largest of the unified combatant commands.