On the first expedition, Longcloth, each Chindit column included RAF Air Liaison personnel who operated wireless sets (carried by mule) to communicate with headquarters to arrange supply drops, and also with the supply aircraft themselves. Steve Fogden's excellent website about Longcloth has a page on the resupply squadrons and Air Liaison personnel: https://www.chinditslongcloth1943.com/squadrons-31-and-194-manna-from-heaven.html

The second expedition, Thursday, was a much larger affair with support from the USAAF 1st Air Commando Group. It involved airborne engineers constructing, from scratch, air bases in the jungle allowing both troops and supplies to be landed within enemy territory, with wireless communications between the various elements in the field and back at bases. RAF personnel again accompanied the Chindit columns to co-ordinate supply drops, close air support and casualty evacuation.