Original: The role of 3FS was to co-ordinate all of the intelligence information from the various D\/F stations and VAOC posts, decide on the most appropriate response and then advise the appropriate fighter or bomber squadrons to respond.
Simplified: 3FS would collect all of the intelligence information from the various D\/F stations and VAOC posts, decide on the what needed to be done and then tell the fighter or bomber squadrons to respond.