This is different from the Intelligence Apparatus that shares inter-service intelligence. The Intelligence Community is already a thing and is organised under the Director of National Intelligence (https://en.wikipedia.org/wiki/United_States_Intelligence_Com...). The point of each service's Agency is to be good at collecting pertinent intelligence data, analysing it, then sharing it with each other if relevant. This way you're not duplicating Intelligence efforts and getting your best value. Inter-Agency communication is a completely different ball game and should be handled separately from organisational structure.