You only have one vox caster, a vox network needs a minimum of two vox casters to function.
Vox-caster: If a friendly officer is within 3" of a unit with a vox-caster when using their voice of command ability, you may extend the range of the order to 18" if the target unit also contains a vox caster.
I'd also switch the Lord Commissar and Company Commander's equipment, as the Lord Commissar is 2+/2+ where the
CC is only 3+/3+
Edit : quotes for the quote from vox rules