The document provides an introduction to the 2019 Health of the U.S. Army National Guard Force Report. It discusses the roles and responsibilities of different types of Army National Guard soldiers including Traditional Soldiers, Active Guard Reserve soldiers, and National Guard dual-status technicians. It notes key differences between these groups in terms of their service obligations, access to health insurance, and age distributions. The introduction explains that the report aims to describe population health metrics and trends among Army National Guard soldiers based on leading health indicators and measures of military readiness in order to help leaders identify challenges and opportunities to improve soldier health and readiness.