The aerospace and defense (A&D) industry has been at the leading edge of the development and adoption of simulation technology since the introduction of computerized tools. The reason is simple: It works in a high-reward/high-risk design space, in which the cost of failure is too high. An engineering success like the Space Shuttle’s first manned flight would have been impossible without the extensive use of reliable and accurate computer simulations that guaranteed all systems and components were working correctly.