How to Say "junior officer" in Spanish
The Spanish word for “junior officer” is “alférez” — B2 level.

Examples
Mi primo acaba de graduarse y ya es alférez de la marina.
My cousin just graduated and is now a navy ensign.
La alférez García recibió una medalla por su valentía.
Second Lieutenant García received a medal for her bravery.
El alférez es el primer grado de la escala de oficiales.
An ensign/second lieutenant is the first rank in the officer scale.
One word for both genders
To talk about a woman with this rank, you don't change the word ending. Just change the 'the' or 'a' in front: 'el alférez' for a man and 'la alférez' for a woman.
Making it plural
Since this word ends in 'z', you change the 'z' to a 'c' and add 'es' to make it plural: 'los alféreces'.
Avoid adding an 'a' for women
Mistake: “La alféreza.”
Correction: La alférez. Even though many Spanish words for jobs change to 'a' for women, military ranks like this one usually stay the same.
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