demobilize
verb [ T ] formal (UK usually demobilise) uk/ˌdiːˈməʊ.bəl.aɪz/ us/ˌdiːˈmoʊ.bə.laɪz/ (informal demob)
（尤指战争结束后）使退伍，使复员
to release someone from one of the armed forces, especially at the end of a war
He was demobilized in March 1946. 他于1946年3月退伍。