Lozovsky served in the Red Army from the mid-1920s, initially serving as a junior officer and fighting in the Sino-Soviet conflict in 1929. He became an armor officer in the 1930s and served at the Battles of Khalkhin Gol. After the beginning of Operation Barbarossa, the German invasion of the Soviet Union, on 22 June 1941, Lozovsky became chief of staff of a tank division before becoming chief of staff of the 15th Tank Corps in mid-1942. After the corps commander was killed in the Third Battle of Kharkov, Lozovsky temporarily took command of the corps. He continued to serve as chief of staff of the unit when it became the 7th Guards Tank Corps, and transferred to the same position with the 10th Guards Tank Corps in 1944. Postwar, he served as a department head in the Main Personnel Directorate of the Ministry of Defense of the Soviet Union.