I knew several age mates who went into the Peace Corps. They came back radicalized and anti-American.
I think that was largely its purpose, to create a sort of left’s form of military academy.
Every time I hear someone suggest a national service program that isn’t military I know what it will be, a program to organize and put them under leadership that will indoctrinate the kids and shape them ideologically and who will identify and connect with the more talented ones to steer them into careers of influence, while at the least influencing the lifelong politics and ideals of the rest.