I dislike using MCO as an example of why engineers should standardize units/use metric. This was one of the first NASA projects to be done using metric units with this exact goal in mind. The more interesting part about MCO is that it's actually a pretty compelling story about engineering culture interacting with management and how risks and problems are handled. It's not as simple as "NASA messed up metric" at all and people could learn a lot by reading the whole story.