Explore a 46-minute conference talk from linux.conf.au 2022 that provides a retrospective on 20 years of NSA Security Enhanced Linux (SE Linux). Gain insights into the speaker's journey as a Linux programmer, the evolution of SE Linux, and lessons learned over two decades. Learn about the initial plans versus reality, the development of skills alongside project improvements, and how a short-term commitment turned into a long-term endeavor. Discover the challenges faced, the importance of documentation, and the impact of SE Linux on the Linux ecosystem. Suitable for beginners to intermediate-level audiences, this talk aims to inspire early-career professionals to engage in major projects and grow their skills over time. Delve into topics such as file labeling, policy development, training policies, and the overall experience of working on a significant open-source project.