Leonor, the Princess of Asturias, will take an oath to the Constitution in October as heir to the Spanish throne.

The princess, who will turn 18 on October 31, is beginning several years of military training as part of her preparation to become monarch.

The Spanish Royal Household in recent days released images of Her Royal Highness at the Zaragoza Military Academy.

Princess Leonor’s father, King Felipe, took the oath before lawmakers in 1986. The ceremony also happened upon his turning 18.

The Spanish Cortes Generales — the Congress and Senate — are preparing for Princess Leonor’s oath as lawmakers struggle to form a government after inconclusive elections.

King Juan Carlos, Princess Leonor’s grandfather, will not be at the official ceremonies, including a reception at the Madrid Royal Palace, but will attend a family gathering at the Royal Palace of El Pardo.

King Felipe and Queen Letizia were quick to express their condolences last weekend following the deadly earthquake in Morocco.

King Felipe, on behalf of himself and his wife, penned a letter to Moroccan King Mohammed. The missive referred to the Moroccan ruler as “brother.”

Spain was one of the few countries initially allowed to send aid workers to the earthquake zone. However, the countries are often at odds.

Morocco, for example, still claims the Spanish cities of Melilla and Ceuta in North Africa. Immigration is another sensitive issue.