The broad range of changes during high school years is the focus of Youth in Transition, a longitudinal study of over 2,000 boys which began during their tenth-grade year. Open-end interview questions asked in 1966 were repeated 18 months later during the second of three rounds of data collection. The boys were asked to tell the major problems in their lives. The results, reported here as a by-product of the total study, revealed a striking increase in worry about the Vietnam war and the draft. Compared to 1966, 31% more boys named these as main problems worried about. It is not known if this reflects the increased proximity to military service or increased national concern focused on the war in Vietnam. (NS)