So, all those guys unloading canisters, wearing fluorescent yellow seem simple enough. It’s for safety, right? It is, but not for the reason you think. They don’t have to worry about visibility. They’ve all got motion sensors on them that go off if something is in their unloading path. HQ started making them wear yellow because the seals on those things leak when the ships reenter Earth orbit. You don’t want to know, but you couldn’t even if you did.