It was reported (January 2012) that the first sub-orbital flight of a new unmanned spacecraft (Divine Dragon) took place successfully in 2011 onboard a rocket booster. The spacecraft is thought to be similar to American X-37B OTV in configuration but smaller. It was developed by the 611 Institute. The latest news (September 2015) suggested that an unmanned "hypersonic cruising vehicle" (>Mach 4) featuring a turbojet/ramjet combined cycle engine (TBCC) was tested for the first time after being released from an H-6 carrier. After the hypersonic flight the HCV returned to the base and landed safely. The latest satellite image (June 2018) indicated that the triangular shaped HCV is entering the service with PLAAF.