This test was a developmental test launch, which differs from routine operational test launches. Rather than randomly selecting a fielded ICBM to verify fleet-wide reliability, a developmental test launch uses a spare missile from storage to validate flight worthiness of new or replacement components in an as-near-to operational environment as possible. Flight Test Unit 2 is the second of four FTUs scheduled over the next several years to validate replacement components that will ensure continued Minuteman III viability. FTU 1 occurred in February 2019.