Originally founded as LTV Electro Systems in the mid-1960s, the company changed its name to E-Systems in the early 1970s. In 1995, Raytheon Company acquired E-Systems, Inc., a Texas-based company that designed, developed, produced, and serviced high-technology systems including surveillance, verification, and aircraft ground-land navigation equipment. The company also developed electronics programs and systems for business, industrial, and non-defense government programs and agencies. E-Systems was renamed Raytheon Intelligence and Information Systems.

In 2013, Raytheon Company announced the consolidation of its six internal business units to four. Intelligence and Information Systems was combined with Raytheon Technical Services Company and renamed Raytheon Intelligence, Information and Services. 

Source: Wikipedia