The MOLLE pack was being distributed to Marines in the early 2000s, and was part of a pack system that had different configurations for rifleman, grenadier, SAW gunner, pistol bearer, and other equipment scenarios. The pack system was complicated and the training was trying to show how to properly wear and configure the equipment to prevent back injury and minimize unnecessary fatigue. At the end of the training learners could select a configuration, specify a list of equipment while seeing calculated weight, and select an optimum setup.