In the battles of the Great Patriotic War since 1943, the mechanic-driver of the tank of the 1454th self-propelled artillery of the Przemysl-Lodz Orders of Suvorov and Kutuzov regiment (11th Guards Tank Corps, 1st Guards Tank Army, 1st Belorussian Front), Petty Officer Amelichkin, acting in an advanced detachment, was the first to approach on January 16 1945 to the Pilica River (Poland) and was the first to force it. Repulsed the counterattack of enemy tanks. Thanks to skillful maneuvering, his crew destroyed 2 T-4 tanks, 3 guns, 20 cars, 30 soldiers and officers, 20 enemy soldiers were captured. He finished the war in Berlin.
For the courage and heroism shown during the crossing of the Pilitsa River, S.G. Amelichkin was awarded the title of Hero of the Soviet Union by the Decree of the Presidium of the Supreme Soviet of the USSR dated February 27, 1945. He was awarded the Orders of I and II degrees, Lenin, Red Star, medals "For Courage", "For the Liberation of Warsaw", "For the capture of Berlin", "For the Victory over Germany". In May 1946, he was demobilized. After the war, he returned to the Kostanay region, worked as a foreman of a tractor brigade, then chairman of the collective farm named after him. Vatutina (later Bolshechurakovsky state farm), chairman of the village. In 1956, he moved to live in a grain farm named after Lermontov in the Uritsky district of the Kostanay region, worked as a combine harvester, a power plant motorist, and a warehouse manager.
He died on February 15, 1981. He was buried in the state farm named after him. Lermontov Uritsky district of the Kostanay region (now a Rural district named after Ilyas Omarov of Altynsarinsky district of Kostanay region). His name is on the Alley of Heroes in the Victory Park of Kostanay. In May 2015, in the Altynsarinsky district in the Square of Glory, a solemn opening ceremony of the bust to the Hero of the Soviet Union Sergey Amelichkin S.G. took place.