  We consider type IIA brane configurations, similar to those that realize
SO(2N) supersymmetric QCD, that include orientifold planes and anti-branes.
Such brane configurations lead to Sp(2N) field theories that become
supersymmetric in the large-N limit and break supersymmetry upon the inclusion
of 1/N corrections. We argue that this class of field theories admit Seiberg
duality and interpret the potential between branes and orientifolds as field
theory phenomena. In particular we find in the magnetic theory a meson
potential that leads to dynamical symmetry breaking and a meson condensate
similar to the anticipated quark condensate in QCD.
