赤軍
せきぐん Red Army (Soviet Union, 1918-1946); Workers' and Peasants' Red Army
Why it means this
赤 (red) + 軍 (an army) — the Red Army; also 連合赤軍, the Japanese far-left militant group of the 1970s.
Breakdown
Each character links to its full entry — origin story, stroke order, and readings.