Among others, in the early 20th century, there was the Lisbon Navy Arsenal, the Doca de Belém submarine base, the Bom Sucesso seaplane base, the Vila Franca de Xira destroyer base, the Vale do Zebro torpedo boat base, the Alcântara Naval Barracks and the Doca da Marinha naval quay.
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A common serial number system is used for aircraft operated by the three military branches, the Portuguese Air Force, Portuguese Naval Aviation and Portuguese Army.