The Huffman grid has a long history with its initial rendition as Huffman Prairie, the first United States Air Force (USAF) immersive 3D-world virtual grid. Over the years, the grid has evolved with newer capabilities but has retained its initial charm and emphasis on the story of flight and the amazing ways aviators have sparked the imagination for art-of-the-possible with new frontiers and discoveries. Upon arrival to the grid, visitors are placed on the original aviator dial landmarking the entry into the first virtual Huffman Prairie campus. A Robert Heinlein Center welcomes visitors and serves as the gateway to a vast flight center supporting flying, ballooning, parachuting, and space travel. The Mars Expedition simulation starts at Huffman. Simulation participants start by taking a reusable rocket booster to the International Space Station (ISS) for continuing the journey to Mars. Upon completion of the Mars Expedition simulation participants return to Huffman in a capsule as it glides gently back to earth supported by large parachutes.