COMMAND CENTER Personnel in the National Guard Command Center in Arlington, Va., monitor the progress of Tropical Storm Isaac as it makes its way through the Gulf of Mexico, Aug. 28, 2012. The center, which provides an overall tracking and coordination of National Guard elements, has gone to 24-hour operations to repond to Isaac. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 632262-N-UHK98-631.jpg Photo Gallery