Government officials are tamping down expectations for efforts to recover debris from unidentified flying objects (UFOs) that were shot out of the sky over North America.The U.S. military says jets shot down one UFO over Alaska on Friday, another over Canada on Saturday, and a third over Lake Huron on Sunday.The U.S. and Canada announced there would be retrieval operations so investigators could better understand these objects. Officials have warned all along how wild terrain and winter weather might complicate the process.“I think it’s important to remind: the objects in Alaska and Canada are in pretty remote terrain — ice, wilderness, all of that — making it difficult to find them in winter weather,” White House press secretary Karine Jean-Pierre told reporters on Monday. “And the object over Lake Huron now lies in what is probably very deep water.”By Tuesday, officials were outright casting doubt on whether these salvage missions will be able to find anything.“If it can’t be recovered, it’s going to be extremely difficult to say with gre …