I marts 2023 blev det annonceret af den spanske forsvarsminister [[Margarita Robles]], at regeringen havde godkendt et kongeligt [[dekret]] for Leonor om at påbegynde et 3-årigt militært træningsprogram.<ref>{{Cite web |first1=Al |last1=Goodman |first2=Issy |last2=Ronald |date=2023-03-15 |title=Crown Princess Leonor of Spain to start three-year military training |url=https://www.cnn.com/2023/03/15/europe/crown-princess-leonor-spain-military-training-intl-scli/index.html |access-date=2023-08-25 |website=CNN |language=en|archive-url=https://web.archive.org/web/20230826115214/https://www.cnn.com/2023/03/15/europe/crown-princess-leonor-spain-military-training-intl-scli/index.html|archive-date=26. august 2023|url-status=live}}</ref> Den 17. august 2023 startede hun sit første år af træning på General Military Academy i [[Zaragoza]].<ref>{{Cite news |last=Sharrock|first=David |date=2023-08-25 |title=Spanish princess starts three years of military training |language=en |url=https://www.thetimes.co.uk/article/heiress-to-spanish-throne-starts-3-years-of-military-training-f90j8cg53 |access-date=2023-08-25 |issn=0140-0460|archive-url=https://archive.today/20230817190547/https://www.thetimes.co.uk/article/heiress-to-spanish-throne-starts-3-years-of-military-training-f90j8cg53|archive-date=17. august 2023|url-status=live|website=The Times}}</ref>
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