"Be discharged from military service due to illness" 或 "Be ordered to retire from the military on account of illness" 都可以表达“因病而奉命退役”的意思。其中，“be discharged from military service”表示“从军队中退役”，“be ordered to retire from the military”表示“被命令从军队退役”，“due to”和“on account of”都表示“由于，因为”的意思。