When Julie was a child she dreamed of one day marching in the military parade down the Champs Elysées on Bastille Day, 14th July. She did so in 2005, dressed in the military skirt and boots (“awfully hot,” she laughs) uniform of a female student at the prestigious École Polytechnique. She remembers having “a few butterflies before the parade, but once you start marching, you forget the stage fright. It went by super quickly,” she marvels…