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The Acoustic and Electro-Optic Propagation Range Site (AEOPRS) is a pair of ranges that conduct experiments relating to the effects of various environmental conditions on acoustic and electro-optic (EO) propagation. The ranges can be instrumented to measure the atmospheric conditions and acoustic/EO signals that have propagated through the complex environment: in particular, a littoral region. The AEOPRS provides the ability to collect detailed meteorological/acoustic/EO data for the development of state-of-the-art models and the evaluation of current acoustic/EO models. The AEOPRS is also the primary site for the Mobile Acoustic Source (MOAS), a system with environmental capabilities that exist in no other system in the world. It is a pneumatic loudspeaker system that allows scientists to verify acoustic models of atmospheric effects. The system is a true exponential horn. It generates sound sufficient for testing acoustic propagation of sources.