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Boston Dynamics is developing the Digital Biomechanics Laboratory (DBL), a physics-based modeling tool for simulating humans and equipment. A key distinction of the DBL is the ability to simulate actively controlled human behavior, tasks such as walking, running, and carrying loads. The DBL combines forward dynamics simulation of the body, contact detection, contact force modeling, equipment modeling, and advanced control to simulate realistic human tasks. We are using the DBL to study the biomechanics of load carriage. In this paper we report on our effort to validate the simulation through comparisons to live subject experiments.