What Second World War use would the US make of PBRs?

How would the United States use a fleet of PBRs transported back to the Second World War?

For riverine and shallow-water operations, possibly with greater value to the US Army than to the blue-water navy.

PBRs are suited to rivers, shore work, and other shallow-water duties rather than fleet operations. Their shallow draft and speed would make them useful for access and patrol where larger warships could not operate. The panel suggests the US Army might find them more useful than the blue-water Navy because riverine work would be their natural employment. Against Japanese destroyers in open or heavily contested water, however, the small patrol boats would be extremely vulnerable.