Ability to performs work requiring a thorough knowledge of machine shop and tool room practices and techniques, properties of various materials, the principles of application and operation of various types of tools, fixtures, dies, instruments and machinery, and the ability to plan and execute difficult work to precision tolerances. 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.