sentences:  The War Office officially adopted Cody's War Kites for the Balloon Companies of the Royal Engineers in 1906, and they entered service for observation on windy days when the Companies' observation balloons were grounded.Like Hargrave, Cody strung up a line of multiple kites to lift the aeronaut, while greatly improving on the details of the lifting gear.He later built a "glider kite" which could be launched on a tether like a kite but then released and flown back down as a glider.