The subjects of communications and intelligence, in a way perhaps, share some commonality. They both deal with transmitting and/or receiving information. Thus, intelligence, for the time being, finds itself under the heading of Communications. At a later date it may fall into a category if its own.
Let's start with intelligence:
Perhaps one of the most intriguing questions one could ask with regards to intelligence is, "Did General MacArthur have any insight into what the Japanese military was doing or planning? Just what level of intelligence-gathering sophistication was in place that proved any worth to the SWPA area of operations?"
MacArthur did, indeed, have a great deal of insight into Japanese military activity and he used it to his advantage. He didn't always accept this intelligence in its entirety or even at face-value. His staff, in particular those men who came with him from Bataan, had much influence over him and he, at times, took their input over that of the intelligence gathering units that he had at his disposal.
The General had crack Australian units that fed him information daily as to Japanese air and naval activity. This information came from virtually every part of the Japanese sphere of influence.
The Australians were able to provide this data because the Japanese code had been broken. The Allies were able to eavesdrop on Japanese radio traffic.