Hi daisynook,
As some of the other posters have said the best thing you can do is apply for his Service records. I have been researching the First Chindits of 1943 for about 4 years now, it would be great to think Robert was one of these men.
The 1943 Chindits were really used to test the Wingate theories of Long Range penetration and air supply. None of the first wave were ever flown out when wounded or sick with malaria and so on. 17 men were lucky to have been picked up when one plane did manage to make a landing on a jungle clearing, but I have the list of those men and Robert was not one of these.
However, 16th Brigade did walk in to Burma in 1944 and many of these men were flown out when they became ill or had been wounded, so my gut instinct would head in this direction. His service records would tell you his regiment and other associated units and then we can really narrow things down.
If you would like an overall good read on the Chindits and their exploits then I would recommend the book 'March or Die' by Phil Chinnery.
Let us know how you get on with the records or if you find some other information on his regiment etc.
Good luck.
Steve.