Lockheed Martin has a large manufacturing facility for missile systems, aeronautical craft and related high tech research. Other notable engineering firms have offices or labs in Metro Orlando: KDF, General Dynamics, Harris, Mitsubishi Power Systems, Siemens, Veritas/Symantec, multiple USAF facilities, Naval Air Warfare Center Training Systems Division (NAWCTSD), Delta Connection Academy, Embry–Riddle Aeronautical University, GE, Air Force Agency for Modeling and Simulation (AFAMS), U.S. Army Program Executive Office for Simulation, Training, and Instrumentation (PEO STRI), United States Army Research, Development and Engineering Command, United States Army Simulation and Training Technology Center (STTC), AT&T, Boeing, CAE Systems Flight and Simulation Training, Hewlett-Packard, Institute for Simulation and Training, National Center for Simulation, Northrop Grumman, and Raytheon Systems. The Naval Training Center until a few years ago was one of the two places where nuclear engineers were trained for the US Navy. Now the land has been converted into the Baldwin Park development. Numerous office complexes for large corporations have popped up along the Interstate 4 corridor north of Orlando, especially in Maitland, Lake Mary and Heathrow.