In a discursive memo to Carter written on the day after Christmas, classified Secret and titled “Reflections on Soviet Intervention in Afghanistan,” Brzezinski worried that the Soviets might not be plagued by the self-doubts and self-criticisms that had constrained American military tactics in Vietnam. “We should not be too sanguine about Afghanistan becoming a Soviet Vietnam,” he wrote. “The guerrillas are badly organized and poorly led. They have no sanctuary, no organized army, and no central government—all of which North Vietnam had.