SecUnits don’t move. Our default is to stand and stare at the things we’re guarding. Partly this is because our non-organic parts don’t need movement the way organic parts do. But mostly it’s because we don’t want to draw attention to ourselves. Any unusual movement might cause a human to think there’s something wrong with you, which will draw more scrutiny. If you’ve gotten stuck with one of the bad contracts, it might cause the humans to order the HubSystem to use your governor module to immobilize you.