Modeling and simulation is also benefiting from object-oriented technologies. Simulations were once stand-alone codes. If one wanted to simulate a joint battle, one began with an existing model (i.e., land combat) and then modified it to include other components (i.e., aircraft and ships). Similarly, if a new technology were to be modeled, new code normally had to be written, even in cases where good, validated, stand-alone technology models existed. The obvious drawbacks to this approach are that it is costly, often produces inferior simulations for the new additions, and quickly results in extremely large codes with commensurate large code management problems. Object-oriented approaches allow models and simulations to be linked to form a richer environment for examining new technologies and joint force structures. Linking force-on-force simulations with design tools such as computer-aided design (CAD) programs and physics-based simulations presents a new type of tool referred to as simulation-based design. Once fully realized, this capability will allow new technologies to be much more easily evaluated, introducing a source for greater efficiency into today's somewhat haphazard acquisition system. Simulations based on object-oriented architectures also promise more flexibility that will enable scenarios and unexpected situations to be made as inputs and simulated rapidly, forming the core for a battlefield visualization system capable of modeling "what if" situations. Outputs from these simulations could be used for mission rehearsal. Even today, pilots and special operations forces often "fly through" crude, three-dimensional renderings of a mission area to familiarize themselves with information such as surface-to-air missile (SAM) sites and landmarks. The promise of computational technologies brings with it potential vulnerabilities that must be protected against threats. In a world where information plays a vital role in warfare, information collection and processing tools will become targets. Defenses against information warfare must be developed. The threat is real and is growing especially in the commercial and private sectors. Even today, malicious hackers devise data-destroying viruses and distribute them through a plethora of electronic media; numerous sites on the Net are dedicated to the discussion and development of offensive computer viruses, with ample tools for even the novice to download and employ. Moreover, computer crimes cost the world economy billions of dollars annually. Although information warfare poses serious threats, the realm of information is where operations underlying Rapid Dominance most reside, and the enemy will find himself fully engaged should he choose to fight on our terms. Rapid Dominance is essentially information warfare on a grand scale in all dimensions of offensive, defensive and leveraging effective use of available information. Communication Technologies