About BAE Systems Space & Mission Systems BAE Systems, Inc. is the U.S. subsidiary of BAE Systems plc, an international defense, aerospace and security company which delivers a full range of products and services for air, land and naval forces, as well as advanced electronics, security, information technology solutions and customer support services. BAE Systems Space and Mission Sector (SMS) is seeking an experienced administrative professional that is organized, collaborative, detail oriented with excellent communication skills to be the primary administrative support to the Vice President of Engineering, Science, and Analysis (ESA).