Nonetheless the Tribunal concluded that Mr Kaluza's period of operational service in respect of that mission ended on 22 February 1969 when he arrived at Butterworth. It reasoned as follows:
In coming to a decision whether the flight on 24 February 1969 was on operational service for Mr Kaluza, we considered the Instrument which specified when each period commenced and ended. We noted by reference to the Instrument, as stated below, that after Mr Kaluza left Vietnam on 22 February 1969, he arrived in Butterworth. We did not have any evidence to satisfy us that he performed duty there associated with a continuing journey to Australia. He then travelled from Butterworth to Pearce on 24 February 1969, but he had arrived at Butterworth on 22 February 1969, and hence his journey had ended on that day as far as operational service went. In coming to that decision we relied on the words of the Instrument which are reproduced below, and found that Mr Kaluza had journeyed to a place (Butterworth), outside Australia, on 22 February 1969. We had no evidence regarding whether Mr Kaluza was at Butterworth on 23 February 1969 to perform duty not associated with a continuing journey to Australia, or whether it was simply a rest day. However either way we are satisfied pursuant to the instrument that the period of operational service for Mr Kaluza, on that occasion, ended on 22 February 1969 when he arrived at Butterworth.
"The period ends:
(a) if, immediately after the person left Vietnam, the person journeyed to a place outside Australia to perform duty not associated with a continuing journey to Australia ‑ on the day that the person arrived at that other place outside Australia, or …"
19 The above reasoning reflects an erroneous construction of paragraph 2 of Schedule B of the Instrument. The issue for the Tribunal's determination was whether Mr Kaluza had journeyed to Butterworth "to perform duties not associated with a continuing journey to Australia". There was, as the Tribunal recorded in its reasons for decision, no evidence that Mr Kaluza had journeyed to Butterworth to perform duties not associated with a continuing journey to Australia - or even that while in Butterworth he had performed duties not associated with a continuing journey to Australia.
20 The plain intention of Schedule B of the Instrument is, as it seems to me, that a person sent from Australia on a mission to Vietnam is to be regarded as being allotted for duty in Vietnam during the whole of the period of the journey to and from Australia - unless the person was diverted to another mission immediately after leaving Vietnam. For this reason the period for which the person is taken to have been allotted for duty in Vietnam commences from the date of the last port of call in Australia (paragraph 1(a)) and ends on the day when the person arrives at the first port of call in Australia (paragraph 2(b)) unless, immediately after leaving Vietnam, the person travelled to a place other than Australia for the purpose of performing duties not associated with a continuing journey to Australia (paragraph 2(a)).
21 The respondent argued that it was open to construe Schedule B of the Instrument as providing that the period for which the person is to be taken to have been allotted for duty in the operation area comes to an end if the person leaves Vietnam to a place outside Australia, unless there is evidence that, at that place, the person performed duties associated with a continuing journey to Australia.
22 I reject the respondent's argument. First, it does not accord with the ordinary meaning of the language of Schedule B of the Instrument. Secondly, it would, inexplicably as it seems to me, treat the homeward journey from Vietnam differently from the outward journey. That is, the relevant mission passed through Butterworth both on the journey to Vietnam and on the return journey. It is not apparent why the stop-over in Butterworth should have no significance on the outward leg but critical significance on the return leg.
23 I conclude that the Tribunal erred in its construction of Schedule B of the Instrument.