Check out here at the NHHC on squadron designations system
After the war Composite Squadrons became the Squadrons that would be used for the nuclear, night fighting, night attack, Airborne Early Warning, Electronic Attack, photo recon (imagine how best to bring a squadron like VC-5 which at the time had F4U-5N, AD-4NA, AD-4NALs, AJ Savage, F3D, F2H-2P, F2H-2N, F2H-2B and a I think a couple of SNJ-6's around just for currency reasons; into the game). As the Composites had some of the extra missions spun off they held on to a few and gained some others. So by the mid-60's they had Photo Recon and being "aggressors" to the fleet air defense problems (ie playing the Red Force attack aircraft so the AA Gunners and Missiles could get thier practice in), finally by the late 70's and 80's as Photo fell out for "National Technical Means" they became the "Aggressors" for the fleet air defense solo or were in specific locations to be the on call air units to be used as the base commander saw fit for operations of the base (like Subic's VC unit which helped to conduct aerial surveys of the damage after the Volcano in the early 90's). There still are VC units in the Navy; one that I know of is VC-6 who operate the drones out of NAS Norfolk for air defense training and small boat defense training. There are also three fighter composite squadrons VFC-12, VFC-13, VFC-111 who provide "Aggressor" training as part of the TOPGUN circulium or Strike Fighter Weapons school instruction for either of the schools on the Atlantic or Pacific Fleet.
Take my word for it. You never want to be involved in an “International Incident”.