The document introduces the themes and challenges that will be discussed at a workshop on human systems integration for soldier systems. It discusses four main themes: 1) physical ergonomics and integration, 2) cognitive ergonomics and integration, 3) system architecture and integration, and 4) physical challenges related to soldier variability, load, and compatibility between soldier system components. Anthropometric data and studies on soldier load and load carriage are presented as examples of analyzing physical ergonomics challenges.