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Aviere is the lowest rank and usually means someone working on the ground and not on board of any aircraft. Such losses may have been of personnel due to strafings, bombardments or even clashes with Partisans...

Concerning Ten. Aristide Sarti (such is the correct name and rank) he is one of the losses of 2° Gruppo Caccia during the dogfight of April 2, 1945. The other "Giuseppe" is either a wrongly reported name or a coincidence, but not a pilot and not a loss in aerial combat.

Hope this helps.