It looks kinda like a Space Shuttle, but it’s markings are Air Force, not NASA.

“Today, we took another important step with the successful launch of the second OTV, enabling the [Air Force’s Rapid Capabilities Office] to further experiment with the vehicle and its ability to operate in low-Earth orbit,” Cooning continued. “Close teamwork between the Air Force Rapid Capabilities Office, the United Launch Alliance Atlas team, and the 45th Space Wing at Cape Canaveral Air Force Station made this launch a success.”

via Second X-37B Space Plane is Now on Orbit | Defense Tech.