Automatic Antivirus Updates

We have 20 to 30 workstations with Symantec Endpoint Protection 11, provided by the US Gov't, installed (unmanaged) that are on a classified network.  Does Symantec have a product that could be purchase that could be installed on our Windows Update Server (for these workstations) that could automatically push antivirus updates to all of the workstations automatically? i.e., similar to the way our Windows Update Server automatically pushes Windows Updates to the workstations automatically?