Well one things for certain from their post they came here to be Americans. If other nations citizens came to this nation with that much drive a lot of fiscal issues would be resolved as well as a lot of resentment. We didn't have any rescues except for S&R for our own crew members. The closest thing we found to anything like that was an empty capsized dingy coming back from the VI's I think.
I was there ('65-'67) as a civilian seven times after I got out of the Navy (USS Jallao - SS-368). No recsues necessary then.