人民军 is a generic noun for 'People's Army', most commonly used in compounds like
朝鲜人民军 (rénmínjūn — Korean People's Army) or
越南人民军 (Yuènán rénmínjūn — Vietnam People's Army). For China's military the standard term is
人民解放军 (rénmín jiěfàngjūn — People's Liberation Army).