The newly installed head of the Pentagon's Golden Dome missile defense shield, a monumental undertaking projected to cost $175 billion over the next three years, knows the clock is ticking to show President Donald Trump some results before the end of his term in the White House.

The Trump administration is expanding its search for partners to build the Golden Dome missile defense system, courting Amazon.com's Project Kuiper and big defense contractors as tensions with Elon Musk threaten SpaceX's dominance in the program,

The new US missile defense system will explore alternatives to Elon Musk's SpaceX, with Amazon. com's Project Kuiper among the main contenders.