Lockheed Martin Corp., Lockheed Martin Space Systems Co., of Sunnyvale, Calif., was awarded a $34,804,061 contract modification which will exercise the fourth option for Space Based Infrared Systems Highly Elliptical Earth Orbit payload three Launch and Early On-Orbit Support. At this time, $548,174 has been obligated. ISSW/PKF, Los Angeles Air Force Base, Calif., is the contracting activity. . .