Rising from the edgeless, wind-scoured, snow-covered tundra on Alaska's North Slope lies a million-pound drilling rig pulling the first commercial oil from a reserve set aside nearly a century ago. ConocoPhillips is the first oil company to draw crude from the National Petroleum Reserve-Alaska, an area the size of Indiana which President Warren G. Harding dedicated as an emergency oil supply for the U.S. Navy in 1923.