Of course they excel at it. Not only do they have more bodies to throw at the problem, but they also made it a strategic military imperative. While the US has certainly had an offensive cyber capability for a long time, it was always, until recently, largely confined to the espionage areas and not so much in the military. It's only relatively recently that the US started taking the offensive side of cyber security seriously enough to properly fund and grow it, especially in the military.
It also helps a whole lot when you get to have a DEEP look into almost every defensive security appliance that gets built in the world since most of them are manufactured in Asia, and mostly right in China. That's a whole other face of having all your hardware production off-shore.