First of all, Brahmins are the highest caste, so these people are basically religious and clergy. Will not enter the army. Even if these brahmins want to join the army and serve in the army, they will not get the consent of their families. For these Brahmins, even if they don't join the army, they can basically maintain their aristocratic life.
Secondly, Khrushchev himself is a military aristocrat and a political aristocrat. They are general political executors and middle and senior generals in the army. From the maharaja to the current military and political dignitaries, this tradition has continued since the founding of India. Moreover, the positions of various military and political officials in India are often continued and inherited, resulting in many high-caste Indians being born military and political officials.
Finally, monasteries have no political privileges, and basically all businessmen belong to monasteries, so not many people actually join the army. Finally, sudra. Because there was no position in society, sudra was the last to perform military service. After all, sudra has no social status and low economic income, which makes the whole sudra community very eager to join the army. After all, after joining the army, they can at least eat enough.