The Australian Defence Force (ADF) is going open source. Using Suse Linux-based clusters of Opteron servers and OpenGL to power the graphics. Defence spokesman claim the simulator boots in roughly 30 seconds on a cluster of 4-core Opteron 2218 servers using NVIDIA Quadro FX 5600G graphics cards. The avionics and aerodynamics simulations run on a number of 8-core Opteron systems. The visuals software was written in OpenGL using commercial and open-source scene graph engines and makes “heavy use of OpenGL Shader Language programs” for creating effects such as clouds, smoke and vegetation.