  The dimensional reduction of the E8 gauge theory in eleven dimensions leads
to a loop bundle in ten dimensional type IA string theory. We show that the
restriction to the Neveu-Schwarz sector leads naturally to a sigma model with
target space E8 with the ten-dimensional spacetime as the source. The
corresponding bundle has a structure group the group of based loops, whose
classifying space we study. We explore some consequences of this proposal such
as possible Lagrangians and existence of flat connections.
