Well now ain't this an interesting post - let me treat it as a sort of a riddle and see how much I can sort out:
crane - Sikorsky CH-54
hook - Boeing CH-47
LZ - landing zone
Instant LZ - LZ created by dropping a bomb into the jungle.
Guess the bomb would have a fuse extender, so as not to createa crater. Maybe if the extender was a little shorter, the stumps wouldn't be so high?
Any nice 'nam era photos, gumshoe59? I would love to see them. Thanks for posting and have a nice day
Paweł