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In this study, we evaluate our work towards sharing unmanned systems among multiple distributed users. We propose a hierarchical approach in which the use of unmanned systems can be requested by secondary users. To support the primary user in managing these requests, we developed a prototype of a planning agent that can generate and evaluate potential solutions that incorporate the request into the mission plan. These solutions can then be provided to support the primary user’s decision-making process. We implemented the planning agent in a helicopter research simulator and validated it with military pilots. Within an experiment, we investigated different configurations that supported the participants on different levels of automation. Results indicate that a higher level of automation caused a positive effect on performance but is accompanied with a loss in situational awareness.