Lockheed CEO Sees World  of Potential Named Lockheed's top executive in August, Robert J. Stevens presides over the biggest defense contractor in the world at a time of shifting military priorities and precarious defense budgets.&lt;FONT face="verdana,MS Sans Serif,arial,helvetica" size="-2"\ color="#666666"&gt;&lt;B&gt;-The Washington Post&lt;/B&gt;&lt;/FONT&gt;