The use of the long-range missiles came as Russian President Vladimir Putin formally lowered the threshold for using nuclear weapons.
The move marks the latest reversal from the White House on what weapons it’s sending and how freely Ukraine can use them.
The program comes amid growing concern from Pentagon and other government leaders about GPS vulnerability.
The unarmed Minuteman III flew 4,200 miles from California's Vandenberg Space Force Base to a ballistic missile test site in the Marshall Islands.
