Quarterly Revenues

Orbital Sciences Corp.'s missile defense interceptor revenues increased $25 million during the fourth quarter of calendar year 2013, according to Garrett Pierce, the company's chief financial officer.

"We also completed two successful missile defense target launches in the month of December" 2013, he told Wall Street analysts during an earnings conference call last week, adding that Orbital delivered three missile defense interceptors and target vehicles during the fourth quarter of 2013.

Pierce said the company plans to deliver "three or four missile defense interceptor and target vehicle[s]" during the first quarter of 2014.

Overall, Orbital reported fourth-quarter 2013 revenues of $375.4 million, compared to $354.6 million in the same quarter of 2012. Fourth-quarter 2013 operating income was $30.5 million, compared to $31.3 million, in the fourth quarter of 2012, according to the company's earnings statement.