Original: The first orbital flight of OTV-1, the first X-37B, with a mission name of USA-212, was launched on an Atlas V rocket at Cape Canaveral Air Force Station, Florida on 22 April 2010, at 23:58 GMT.
Simplified: The first orbital flight of the X-37B, was launched on an Atlas V rocket at Cape Canaveral Air Force Station, Florida in April 2010.