The chief executive of Vencore is rapidly remaking the company, turning a former Lockheed Martin unit into a services company with a much broader range of customers and capabilities. Mac Curtis, named CEO of the company in 2013, last led Vangent, the IT contractor purchased by General Dynamics in 2011 for nearly $1 billion. Now, he said, he is focused on bringing together what was known as Lockheed's Enterprise Integration Group with the QinetiQ North America services and solutions group,...