Depicted rocket (explained below) is a Falcon Heavy. At the date of the picture there had been 3 launches, only 1 of which wasn't during the day, meaning this is depicts the USAF STP-2 mission.

Aside from the 3-booster setup, the rocket is also identifiable by it's fairing shape and the strongback.

The image is dated 2019-11-18, which happens to be the launch date of Starlink L1, but this launch is unrelated to this picture.