Question

How did the draft change the U.S. force in Vietnam

Answer 1

Because it was the cold war, a mobilization of military reserves would be a sign to the Soviets, that the US was raising it's military defensive posture, which could also mean offensive status.

Answer 2

Because it was the cold war, a mobilization of military reserves would be a sign to the Soviets, that the US was raising it's military defensive.