The highly sophisticated, multibillion-dollar defense system has been under constant redevelopment since its inception in the early 2000s. Here's how it works.
I usually take SMH as them saying they're nodding in disapproval or judgment. It's kind of like how a wise adult would see two immature kids having a disagreement over something insignificant and easy to resolve, but their egos get in the way. The adult would nod and perhaps sigh or say, "tsk, tsk," to themselves. Anyone else see it this way or differently?