The paper first describes something about defense simulation internet and virtual reality, then discusses some questions on virtual reality system design technology in defense simulation internet.

本文首先介绍了作战仿真互联网和虚拟现实技术的有关知识，然后详细阐述了作战仿真互联网中虚拟现实系统设计技术的几个重要问题。

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Naidoo added that police and defense forces also successfully carried out two security simulation exercises during the recent national elections and international cricket tournament in South Africa.

VOA: standard.2009.06.12

Philip Nuber, director of the Defense Mapping Agency, says that using this virtual technology in flight simulation can help soldiers in peace time as well as war.

CNN: Pilots study virtual terrain of Bosnia