[Toadman]

Actually there's the American PC (recently transferred to the Coast Guard). You could do a trans-oceanic trip on board but wouldn't like it! I know one did a Pacific transit in the 90's. Ship and crew were pretty banged up.

[R. Scott]

Patrol boats are generally not considered “oceanic war vessels”. The US Army has never differentiated between “oceanic”, “coastal” and “river” on an operational level. If a boat was needed it sailed. I’ve sailed the old 1466 class LCUs and Mike 8s in Pacific typhoons because of operational necessity.
And yes – the crews were banged up a bit, but that was part of the fun.