I may be misinterpreting your post, but the US-2 in my logbook, was a Grumman 'Tracker" (w/ASW gear removed) ... and only made water landings when experiencing a double engine failure on a carrier launch.
BzB
The Japanese refer to their newest flying boat as the US-2, the previous version was the US-1 which itself was a version of the PS-1 (aren't you glad you asked? ). They also have/had C-2s and T-2s, not the kind you are thinking of though.