Aerial mines
Aerial depth charges
Merchant ship task groups - strat convoy
U-boat task groups - can hunt merchant convoys
ASW trawler/corvette/sloop task group - can hunt U-boat task group
Minesweeper task group - can remove aerial mines
Escort Carrier group - CVE has limited planes and CL not CA, DE not DD
Swordfish, Catalina, Condor, Sunderland, Beaufighter, Firefly, I dream on...