V-2 rocket offensive began on 8 September 1944, when "Lehr- und Versuchsbatterie No. 444" () launched a single rocket guided by a radio beam directed at Paris. Wreckage of combat V-2s occasionally contained the transponder for velocity and fuel cutoff. The painting of the operational V-2s was mostly a ragged-edged pattern with several variations, but at the end of the war a plain olive green rocket also appeared. During tests, the rocket was painted in a characteristic black-and-white chessboard pattern, which aided in determining if the rocket was spinning around its longitudinal axis. The original German designation of the rocket was "V2",
Type 81 (rocket launcher) enable both the 122 mm rocket series and 220 mm rocket series to be adopted on a single chassis, using the same fire control and support systems, hence greatly reduces the operational cost. The SR-5 has been exported to Algeria, Bahrain and Venezuela. The SR-7 is a scaled-down variant, with either one pod of twenty 122 mm rockets or six 220 mm rockets. The maximum range is 50 km for the 122 mm rocket and 70 km for the 220 mm rocket. Type 81 (rocket launcher) The Type 81 is a self-propelled 122 mm multiple rocket launcher (SPMRL) produced by