Given the US can't stop hackers from infecting hospitals and businesses which effectively shuts them down until they pay a ransom to unlock the key, I am certain we do not have the technical expertise to defeat much of anything. Think about it. We all get tons of phishing EMAILS every day from scammers, ISIS is recruiting at will, and bad guys in Russia, Somalia, and other nations have created a cottage industry of using technology to harvest personal data for identity theft.
We have a completely incompetent government squandering our national treasure while simultaneously opening our borders to all manners of invaders. We can't stop them, track them, or even verify if they can work here because we lack the political will. You bet your ass that we can't defend ourselves from much of anything! The only thing this government can do is to pay people to not work, to waste money on programs that don't work, and to enrich defense contractors by having them build sophisticated systems that are prohibitively expensive and can be easily defeated by insiders or those who have penetrated the security veil.
Think about how easy it is to build an Obamacare website vs a system that can detect and defeat an incoming missile, any time, any place, 24x7 with virtually no down time. Then rest well knowing that a community organizer is commander-in-chief.