Cadet (noun)

1. A trainee in a military or naval academy.
2. A student in a military or naval academy.

Origin:

From french cadet, from old french capdet, from old occitan capdet, from cap ("head") + -et (diminutive suffix), from latin caput ("head").

Examples:

1. He was a cadet at the military academy.
2. She was a cadet at the naval academy.
3. The cadets were training for the military.
4. The cadets were training for the navy.
5. The cadets were training for the air force.