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Pontella, Indian Ocean (Pontella speciosa, Pontella detonsa ?, Pontella princeps, Pontella fera, Pontella valida)
The GPS Operations Center at Schriever Air Force Base in Colorado Springs controls the GPS satellites.
One of six ships of the U.S. Exploring Expedition, the Porpoise sailed around the world between 1838 and 1842.
Snakes, South America (Callirhinus patagoniensis, Dendrophis prasinus)
Staff Sgt. Derek Howard, 816th Expeditionary Airlift Squadron, watches cargo bundles delivered by the Joint Precision Air Drop System (JPADS) to a drop zone in Afghanistan.
This sword made from shark teeth was collected by the U.S. Exploring Expedition in the Gilbert Islands.
The successful operation of a satellite navigation system requires around-the-clock monitoring of the satellites’ health and the periodic replacement of older satellites.
The increasing reliance on navigation satellites for military and commercial activities makes them a tempting target for an enemy.