From Popular Mechanics:"LF" popped up on the screen in a bunker containing intercontinental ballistic missiles this past week. What does it mean? Launch Facility Down. In other words we lost contact with 50 nuclear missiles—one-fifth of the stockpile—for nearly an hour. Here's a look at this technical error and other acronyms that relay the status of our nation's weaponry.
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My Comment: Will that day ever arrive in which these acronyms are used in a real situation .... God ..... I hope not.