Amid worldwide demand and slow production of Patriot missiles, few countries are willing to send more to Ukraine. The U.S. also fears antagonizing Russia.

The drills come as President Donald Trump revealed details of the Golden Dome initiative, which is intended to protect the U.S. homeland from missile threats.

We will truly be completing the job that President Reagan started 40 years ago, forever ending the missile threat to the American homeland,” Trump said in the Oval Office.

The following is the May 15, 2025, Congressional Research Service In Focus report, Hypersonic Missile Defense: Issues for Congress. From the report The Missile Defense Agency (MDA) and Space Development Agency (SDA) are currently developing elements of a missile defense system that may be able to defend against hypersonic weapons and other emerging missile threats.