Prior to introduction of new subsystems, or in the process of managing existing configurations of subsystems, it must be ensured at the soldier system level that the overall level of ability is developed in a positive direction and that the capability is improved. This will be even more important in the future when trade-offs between different subsystems is necessary to avoid soldier overload while maximizing the ability to operate in the battlefield. New ways of testing and evaluating the ability of a soldier system are required, methods that differ from current approaches to verifying the technical capabilities of individual subsystems. The Marine Corps Load Effects Assessment Program (MC-LEAP) was evaluated during one week of September 2016. The evaluation took place at the Marine Corps base in Quantico, US, and was conducted in cooperation with Norway. Participants from Sweden were personnel from the Land Warfare Center (MSS) and the Swedish Defence Research Agency (FOI). Norway contributed with personnel from the Norwegian Army and the Norwegian Defense Research Institute (FFI). The troops consisted of eight and ten soldiers respectively. MC-LEAP is a concept that, apart from a dedicated obstacle course with associated stations, includes an integration laboratory with instrumentation for measuring anthropometry and facility for design and modification of carried and worn equipment. The obstacles have been developed to represent such situations, and hence tasks and burden, that the soldier may face during urban combat or movement in terrain. The obstacles aims to show to what extent the characteristics of the equipment configuration, in terms of weight, bulk and stiffness, affect the soldier's mobility and thus time for execution of particular tasks. The MC-LEAP concept is intended for studies of interaction effects between soldier and worn and carried equipment and is focused on dynamic aspects of ergonomics. The obstacle course and its stations were carried out by the squad for a number of different equipment configurations during five days, where the first day was allocated for introduction and training. Information was gathered about functional and technical aspects of the concept, how it was set up and operated, and recorded measures. The results from the soldiers' performance have been analyzed and used to provide an in-depth understanding how the concept can be used for evaluation purposes. The conclusion is that MC-LEAP is a tool that has potential to provoke existing problems around worn soldier equipment. The great value of the concept is the proven methodology that is based on a soldier task analysis and experience from long-term use. The MC-LEAP concept is considered useful in different phases of a procurement cycle from requirements definition to validation of functionality prior to equipment fielding.