  We investigate two models of much recent interest in lattice Beyond Standard
Model studies: N_f=2 fermions in the 2-index symmetric (sextet) representation,
and N_f=12 fermions in the fundamental representation, both with SU(3) gauge
symmetry. We present results at fixed lattice spacing for the static fermion
potential and force as measured via lattice simulations. We show indications
that both models are confining in the chiral limit and that neither theory is
conformal. This is consistent with our findings for the mass spectrum, which
indicate that chiral symmetry is spontaneously broken in both theories.
