McLean-based Sotera Defense Solutions said Monday it has named Deborah Alderson, formerly of SRA International and Science Applications International Corp., president and chief executive.

Alderson takes over from John Hillen, whose departure was announced last month.

She comes to Sotera from SRA, where she was chief operating officer.

She could not immediately be reached for comment.

In 2011, Alderson was removed from her position as president of SAIC’s defense solutions group, in connection with the company’s troubled CityTime contract with New York City. The U.S. Attorney’s Office for the Southern District of New York alleged that “a massive and elaborate scheme to defraud the city” corrupted the program.

“While we are aware of no evidence that these individuals had any personal involvement in the fraud uncovered in the CityTime program . . . we must maintain the highest standards for all of our employees and for our industry, beginning with our management team,” Walter P. Havenstein, SAIC’s former chief executive, wrote in a memo at the time.

Before working at SAIC, Alderson was president of the systems engineering group at Anteon.

Hillen had run Sotera since 2008, including taking the company public in 2009 and selling it to a private-equity firm in 2011. (The company was previously known as Global Defense Technology & Systems.)