Vietnam assignments "in country" were usually limited to thirteen months fixed duration. Service members reported in and departed individually on fixed departure dates termed DEROS (date of rotation) instead of with their whole unit altogether.
Explain how can we evaluate the impact that deploying individually instead of by unit had on those who served those tours? How might that vary between those who had joined the Army voluntarily and those who had been conscripted for service by using the Selective Service System?