An Atlas V rocket will launch an X-37B space plane on a secret mission for the U.S. Space Force and Air Force on Saturday, May 16, and you can watch it live here courtesy of the United Launch Alliance (ULA).

A ULA Atlas V rocket is scheduled to launch the X-37B Orbital Test Vehicle 6 mission, or OTV-6, at 8:24 a.m. EDT (1224 GMT). A webcast from ULA will begin about 20 minutes before launch time.

The upcoming OTV-6 mission will mark the seventh mission the U.S. Space Force, and has the designation USSF-7. It will launch from Space Launch Complex 41 at Cape Canaveral Air Force Station in Florida.

The X-37B is an uncrewed space plane operated by the U.S. Air Force Rapid Response Capabilities Office. The Air Force and Space Force have two of the robotic space planes and have launched five long-duration, but classified, missions since 2010.
From United Launch Alliance:

Rocket: Atlas V 501
Mission: USSF-7
Launch Date: May 16, 2020 at 8:24 a.m. EDT.
Launch Location: Space Launch Complex-41, Cape Canaveral Air Force Station, Florida

Mission Information:
A United Launch Alliance (ULA) Atlas V 501 rocket will launch the United States Space Force-7 (USSF-7) mission, carrying the sixth flight of an X-37B Orbital Test Vehicle, OTV-6. Liftoff will occur from Space Launch Complex-41 at Cape Canaveral Air Force Station, Florida.

The Department of the Air Force Rapid Capabilities Office continues to push the flight envelope for the X-37B and will build upon its growing collaboration with experiment partners with its sixth mission. The mission will also deploy FalconSat-8, a small satellite developed by the Air Force Academy and sponsored by the Air Force Research Laboratory to conduct several experiments on orbit.

The mission also carries two NASA experiments to study the results of radiation and other space effects on a materials sample plate and seeds used to grow food. Another experiment provided by the Naval Research Laboratory will transform solar power into radio frequency microwave energy which could then be transferred to the ground.
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At a glance: A United Launch Alliance Atlas V 501 configuration rocket will launch the USSF-7 mission for the U.S. Space Force. In a show of national solidarity this launch will be dedicated to honor front-line responders and those affected by COVID-19. This will mark the sixth flight of the X-37B Orbital Test Vehicle (OTV-6).

Launch Notes: This will be the 139th mission for United Launch Alliance. It is the 84th for an Atlas V rocket and the 7th in the 501 configuration.