Liftoff of the USSF-87 mission occurred at 4:22 a.m. ET on Thursday (Feb. 12).

Vulcan Centaur rocket launches 'neighborhood watch' satellites for the US military

Source: space
Source Link: https://www.space.com/space-exploration/launches-spacecraft/ula-vulcan-centaur-ussf-87-launch-space-surveillance-satellites