The National Environmental Policy Act (NEPA) of 1969 requires federal agencies to examine the potential environmental effects of their actions to allow for more informed decision-making. An Environmental Impact Statement (EIS) is a detailed public document that provides an assessment of the potential effects that a major federal action might have on the human, natural, and physical environment. An Overseas Environmental Impact Statement (OEIS) is prepared to comply with Executive Order 12114, Environmental Effects Abroad of Major Federal Actions (1979). This order requires federal agencies to consider the potential effects of their actions on the environment outside the U.S. territorial sea. The Navy's analysis under NEPA extends through the U.S. territorial sea (from shore to 12 nautical miles).