The U.S. Coast Guard’s advanced command, control and direction-finding communications system executes search and rescue missions with far greater agility and efficiency saving lives and property.Rescue 21 is the U.S. Coast Guard’s advanced command, control and direction-finding communications system. The system was created to better locate mariners in distress, save lives and property at sea and on navigable rivers. By harnessing state-of-the-market technology, the General Dynamics-built Rescue 21 system enables the Coast Guard to execute its search and rescue (SAR) missions with far greater agility and efficiency.