This is the 12325th most frequent Russian word.
кадетов
"Кадетов" is the genitive plural form of "кадет," meaning "cadet(s)" (students at a military school).
Here, 'кадетов' is the genitive plural of 'кадет' and is used to denote 'of cadets.'
Многие кадетов из академии приняли участие в параде.
Many cadets from the academy participated in the parade.
In this sentence, 'кадетов' is in the genitive plural form, used as a direct object in a specific context.
Мы видели группу кадетов, изучающих топографию.
We saw a group of cadets studying topography.
'Кадетов' in this context is the genitive plural, denoting the concept of the group of 'cadets' for whom responsibility is held.