operating system | Super Nintendo Entertainment System | Nintendo Entertainment System | RAF Bomber Command | Android (operating system) | Strategic Air Command | Global Positioning System | Air Training Command | Solar System | Air Education and Training Command | X Window System | Korean Broadcasting System | United States Central Command | System of a Down | Domain Name System | IV Fighter Command | Seoul Broadcasting System | North Carolina Community College System | Mutual Broadcasting System | Bulletin board system | system | Air Defense, Tactical Air Command | Turner Broadcasting System | Tactical Air Command | Program and System Information Protocol | Geographic information system | United States Pacific Command | Ubuntu (operating system) | Tokyo Broadcasting System | Federal Reserve System |
On April 30, 2010, Homeland Security Secretary Janet Napolitano announced that Allen would serve as the National Incident Commander for the federal government's response to the Deepwater Horizon oil spill in the Gulf of Mexico.