The Defence Strategic Review (DSR) highlights the need for effective Mission Engineering (ME) to develop capabilities that meet specific mission objectives efficiently and cost-effectively. For ME to be effective, adaptable systems need to be developed that can address a wide range of evolving problems and meet specific mission requirements. Such systems must be versatile and broad, remaining relevant across various scenarios and precise needs. This demands significant foresight and ingenuity in the design stages, where architects must anticipate future challenges and opportunities, embedding both flexibility and specificity into the system. Mission-aware systems offer a solution to this challenge by integrating mission goals directly into their architecture and development lifecycle, ensuring technical soundness and alignment with future mission requirements. This alignment is crucial in contexts where strategic planning and execution are essential, synchronizing technological and human capabilities for mission success. By aligning systems engineering efforts, which focus on technical development, with mission engineering, which emphasizes overall mission success, organizations can ensure that their technological solutions support strategic objectives. This paper proposes an approach for designing mission-aware systems by integrating ME with Model Based Systems Engineering (MBSE). The integration occurs in two stages: first, by introducing missions as an intermediary that influences system capabilities alongside operational capabilities through a structural causal model; and second, by mapping ME frameworks, such as the DoD ME guide, with systems architecting frameworks, such as the DoDAF or MoDAF, to create a unified profile. This unified profile is used to describe and document ME artefacts within the MBSE model, ensuring that mission requirements are integrated into the system design from the outset. This approach, also, provides a common language between ME and MBSE, producing mission-compatible products that facilitate mission guided system design and evaluation.