  The fusion system of a finite group at a prime $p$ is a category that encodes
all conjugacy relations among subgroups and elements of a given Sylow
$p$-subgroup. Such a fusion system is tame if there is some (possibly
different) finite group that realizes it, with the property (very
approximately) that all automorphisms of the fusion system are induced by
automorphisms of the group. In this paper, we prove that all fusion systems of
finite groups are tame. This was already known for fusion systems of (known)
finite simple groups, and the arguments here consist mainly of a reduction to
that case. In particular, this result depends on the classification of finite
simple groups.
