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There are several books about 10 Sqn and its Halifax operations - "Gordon's Tour On Shiny Ten" seems to ring a bell. What squadron was he on in the far east? You mentioned Indo-China which immediately suggests 357 Sqn but could be one of the general transport units (31, 117, 194 and later 52).
Send me a private message with your e-mail address and I will send you an electronic copy of the narrative for the award of his DFM and the countersigning officer's comments.
You don't say whether you knew he had been awarded the decoration. You might want to check that he has also got the full set of campaign medals to which he is entitled. By my reckoning it should be something like: 1939-45 Star, Aircrew Europe Star, Burma Star, Defence Medal, War Medal. These are in addition to his DFM and there might be variations depending on precise timings of service etc.
O-D