My family owns part of an airport in a remote part of Montana, one night a C-130 landed, dumped some humvees that "secured" the tarmac. The guy running the airport said he then saw lights is the air moving in a fairly unusual manner, zig-zagging and so forth. Not something a plane or helicopter would do. He's a pilot, and not easily ruffled so I'm inclined to believe him. The humvees loaded up in the C-130 and took off, didn't say a word.
Strange stuff