For the second time in as many weeks, NASA has chosen Lockheed Martin (NYSE:LMT) to support human spaceflight missions through the Johnson Space Center.

Following up on last month's 10-year, $250 million contract to provide "biomedical, medical and health services in support of all human spaceflight programs" to JSC, Lockheed announced Wednesday that it has won a second contract for $166.8 million. This latest contract extends by one year -- through Sept. 30, 2014 -- a pre-existing NASA contract to "support ... hardware, software, data and display systems used to train for and execute all human spaceflight missions supported by the Mission Operations Directorate." According to Lockheed, this brings the value of the underlying contract up to $1 billion.

Lockheed shares gained 0.3% in response to the news, dodging the market's downturn Wednesday, and closing at $99.35.