sentences:  Walsh was appointed Chief of Staff in 1980, taking over from Air Marshal Frank Mussell.In 1981, after Robert Mugabe had become prime minister, the Zimbabwe-Rhodesia Air Force was renamed the Air Force of Zimbabwe and Mugabe offered command of the air force to Walsh which he accepted.Walsh's priorities were the recruiting of new personnel from the former guerrilla fighters and replacing outdated aircraft with up-to-date types.