This report is one in a series that compares data from the American Community Survey (ACS) with data from the Annual Social and Economic Supplement (ASEC) to the Current Population Survey (CPS). The report focuses on comparisons of national and state distributions of veteran status and period of military service between the 2007 ACS and the 2007 ASEC. It suggests possible explanations for those differences that are both statistically and substantively different.