Certainly. I just wanted to clarify what "slave-warrior" meant in this context, because in itself the word makes me think of actual slaves living in misery and getting thrown onto enemies to keep them busy getting killed. Originally janissaries were taken forcefully, but the careers they made, many families bribed the collectors to pick their children, and later, muslims too forced the govenrment to make the concession of accepting their children into janissary "ocak"s. Not only, but janissaries started getting families (forbidden initially), and making their children janissaries too, and thus the corruption of the janissaries. Also, janissaries were not mere warriors. They took part in many activities and had many responsabilities in peace time. E.g. the firemen of Constantinople were janissaries. They were also the ruling elite in some remote parts of the empire.
BTW while "taken from their families" is correct, many kept ties with the families. The Sokollu dynasty of grand viziers who practically ruled the empire for decades were taken the same way, but the first of Sokollus, Mehmen Sokollu, was not only able to pass on his position to his relatives, he re-established the Serbian Orthodox Church and got his brother to become its patriarch. We can discuss the humanitarian aspects of this, but practically, these people are not slaves at all; in fact, thinking that these people were slaves is downplaying what a disaster actual slavery is.