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The Vertical Flight Society (VFS) is the world’s oldest and largest technical society dedicated to enhancing the understanding of vertical flight technology. VFS is a non-profit education and technical organized recognized by the U.S. Internal Revenue Service as a 501(c)(3) charity. 
Since it was founded in 1943 – just as the first US helicopter was being put into service – the Society has been the primary forum for interchange of information on vertical flight technology. According to the VFS Bylaws, the purpose of the Society is to "advance the theory and practices of the science of vertical flight aircraft."