yes there must be a "Target destroyed" Radio call sound file in all ErprGr210 Missions, but you must destroy the target in Mission18 it is the Spitfire on the west side.
in this Video (Mission2) you see the Radio Call Text and hear the Sound file, before Target (to find the target) after Target (target destroyed) and go Home radio call, so in this video (in game too) you hear 3 Desastersoft sound files.