"vital industries or occupations" . "protected industry" . . "\\\"reserved\\\" occupations" . "preventing key workers from leaving their employment" . . "restricting key workers from leaving their posts" . "exempt from military service" . . . "essential jobs" . . "reserved occupation" . . . . "reserved industry" . "essential services" . "Reserved occupation" . "\u2018essential work\u2019" . "Reserved occupation" .