In the context of ever-increasing globalization, security and defence strategies become inextricably linked. Global threats up come. A boost in the number of crisis, crisis of different nature (natural disasters, technological accidents, complex man made crisis) that occur anywhere, emerging risks. The concept of threat is changing from a physical enemy to be fought by weapons, to an insecurity permanent feeling impacting the daily life of citizens. Defence becomes a part of a whole security strategy. This evolution entails an integrated approach involving different actors from military and civil contexts. Integration and interoperability are also concepts to be taken into account in the current context of financial crisis for the development of capabilities. Space systems have been playing an essential role in the security and defence domain, at strategic, tactical and operational level. When different technologies are integrated, higher performance products and services are obtained and a wider spectrum of applications can be generated.Integration can be performed at different level: while added value products can be obtained with the combination of data acquired by sources operating in different environments such as ground, sea, air and space, or by different space technologies (Earth Observation, Navigation), integrated services (or applications) are obtained by combining different systems. Why is integration so important to face the new aspects of security? Within the core institutional use, integration brings more efficiency and provide services unobtainable otherwise (added value for more reliable information, surveillance of remote areas, crisis response). Within the emergent risks, integration provides "cost -effective" solutions to new users.Far from being exhaustive, the article gives an overview of the different applications domains, the current developments and trends. Considerations apply to the European context as well as projects and programs given as examples.
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