WASHINGTON (AP) — China's growing military muscle and its drive to end American predominance in the Asia-Pacific is rattling the U.S. defense establishment.

American officials see trouble quickly accumulating on multiple fronts — Beijing's expanding nuclear arsenal, its advances in space, cyber and missile technologies, and threats to Taiwan.

“The pace at which China is moving is stunning,” says Gen. John Hyten, the No. 2-ranking U.S. military officer, who previously commanded U.S. nuclear forces and oversaw Air Force space operations.