The Department of War said that it is developing an advanced defense system called the "Golden Dome." 

In a series of posts on X, the department called it a "layered, integrated shield" that will defend the U.S. against ballistic missiles, hypersonic missiles, advanced cruise missiles and next-generation aerial attacks.

"From a NORAD and NORTHCOM perspective, the requirement is clear. To defend North America and win tomorrow's fight, we must maintain our war fighting advantages and operate beyond stove-piped systems operating at human speed. Golden Dome is forging the integrated, automated battle management network needed to see every threat, make decisions in milliseconds, and keep America safe," said Maj. Gen. Mark Piper, deputy director of operations at NORAD.

Gen. Mike Guetlein, director of Golden Dome, said that the system is real. 

"It is no longer theoretical," he said. "We are underway. We are shovel ready, and we're building it now."