Systemic racism in the US ment an inproportionate number of drafted service personnel were black as white draftees were able to get college deferments in higher numbers.
This boiled back down to the poorer economic situation of black peoples in the Civil rights era fighting for basic equality.
The draft also caused friction that increased fraggings as this racist treatment by educated white officers or NCOs were dealt with locally. Fragging was furthered by a disconnect between draftees who wanted to just survive and glory hounds who saw military service and War as some great adventure.