In Cloud Computing age, distributed interaction simulation would encounter many difficulties, especially the WAN-based interaction. A scheme of remodeling the traditional RTI software to be with "Platform as a Service (PaaS)" architecture was proposed. This paper puts forward two different software architectures to adapt to different network environments. Kernel idea is encapsulating the APIs of traditional RTI to be Web Services, deploying and scheduling these Web Services on servers, so, a distributed interaction platform is provided to simulation users on WAN. Users could utilize the services from the platform to execute simulation interaction. Finally, an experiment was carried out to test the time-latency performance of the remodeled software.

Research and application on wireless sensor networks in the future counterterrorism operations, including the target perception network, target guiding network, combat command control and the fire control network. Access to information and knowledge through the wireless sensor networks. Counterterrorism capacity can be upgraded, and precision strike over the horizon can be realized. The networks change the classical counterterrorism operations, reconnaissance and security mode. Qualnet simulation results show that packets loss rate of wireless sensor networks is small, and the peer to peer delay is short. The networks is suitable for counterterrorism operations environment.