At 1:13 a.m., the operational test got launched from the Californian Vandenberg Space Force Base.
North of Santa Barbara, approximately 60 miles
This ICBM launch is intended to "check and test the system's readiness and efficacy."
Concerns about nuclear security are raised in light of the missile launch.
The US military postponed the test to prevent relations with Beijing from becoming more tense.
The two tests, according to Ryder, were organised in advance and are taking place simultaneously because the first one had to be postponed.