Lockheed and Raytheon grew their staff by about 5 percent between 2017 and 2018 according to Callan, the Capital Alpha analyst. Northrop’s headcount rose from 70,000 to 85,000, “but we don’t know how much of that was due to the Orbital ATK acquisition.” Orbital reported 13,900 employees in 2017, meaning the it might have actually grown only about 2 percent to 3 percent, he wrote in a Feb. 17 note to investors.