The ATESTís primary focus is to develop specialized software for the analysis and visualization of the effects of RF propagation on EW-related problems for the Navy and other DoD customers. The ATEST provides customers with an understanding of the RF environment with the effects of meteorology, terrain, building structures and countermeasures. This specialized software is known as Interactive Scenario Builder, (or “Builder”) is currently in its third major revision. Builder is a three-dimensional propagation and visualization tool that integrates National Geospatial-Intelligence Agency (NGA) terrain and imagery with CIB imagery and DTED elevation data. Through the usage and development of Builder as well as other high fidelity simulations, ATEST is able to address temporal land, sea and air problems ranging from the engineering to the campaign level. Applications include Strike Group mission planning and analysis, tactical decision making and Counter Radio Controlled IED (RCIED) defeat analysis.