duty of performing military service

英 [ˈdjuːti ɒv pəˈfɔːmɪŋ ˈmɪlətri ˈsɜːvɪs] 美 [ˈduːti əv pərˈfɔːrmɪŋ ˈmɪləteri ˈsɜːrvɪs]
duty of performing military service
服兵役的义务