context: When he finished his schooling at Krefeld's Moltke Gymnasium, he joined the Krefeld Militia.
source: As the war erupted, Voss qualified as a motorcyclist and motorcycle mechanic.
reference_original: Al estallar la guerra, Voss estudió para ser motociclista y mecánico de motos.
reference_flipped: Al estallar la guerra, Voss estudió para ser motociclista y mecánica de motos.