Modern military, civil, and commercial systems must operate reliably for decades, and because of that, organizations increasingly rely on Designing for Obsolescence as a foundational engineering strategy. Throughout their lifecycle, these systems must continuously adapt to evolving operational requirements, emerging technologies, regulatory changes, and external constraints such as funding, schedules, and risk. Consequently, lifecycle management aims to maintain a system’s operational effectiveness from acquisition through long-term utilization while ensuring affordable maintenance and sustainable support.