HUNTSVILLE, Ala. (NASA PR) — Ask International Space Station facility engineers and payload operations teams at NASA’s Marshall Space Flight Center in Huntsville, Alabama, what makes them proudest as they look back on two decades of developing and testing science hardware and providing real-time support for experiments on orbit. Many will instinctively glance upward, as if the source of that pride might be passing overhead at that moment, 250 miles up.

Just as often though, they look to one another.