Frequently there were cooperative efforts among aircraft and antisumbarine vessels in tracking and attacking U-boats. We are used to seeing roundels on aircraft. This collection shows roundels painted on chasers, for the purpose of allowing Allied aircraft to identify them during ASW operations.

In most cases, the roundels were painted on the deck forward of the pilot house, around and over the anchors -- presumably because this area was one of the only spaces not normally occupied by guns, depth charge launchers or other equipment.

New to this collection is a curious photograph, showing a roundel painted on the wherry canvas of a chaser. Not a bad idea!