Squibbler: An autonomous penetration of controlled airspace is carried out by approved radar units with the controller concerned being responsible for separating his traffic from all other traffic in the regulated airspace thus avoiding the need to co-ordinate.
To get back to the original question: a MATZ is class G airspace, but instructions from ATC to a military pilot in a MATZ are mandatory, thus making it radar control for military aircraft; radar advisory service may be available to participating civil aircraft.