Subj. of a National Historic Site outside Wall, S.D.

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ICBM.

Last seen on: NY Times Crossword 23 Jun 19, Sunday

Random information on the term “ICBM”:

A ballistic missile goes through several distinct phases of flight that are common to almost all such designs. They are, in order, the boost phase when the main boost rocket or upper stages are firing, the post-boost phase when any last-minute changes to the trajectory are made by the upper stage or warhead bus and the warheads and any decoys are released, the midcourse which represents most of the flight when the objects coast, and the terminal phase as the warhead approaches its target and, for longer-ranged missiles, begins to reenter the atmosphere.

These phases are particularly important when discussing ballistic missile defense concepts. Each phase has a different level of difficulty in performing an interception, as well as a different outcome in terms of its effect on the attack as a whole. For instance, defenses that take place during the terminal phase are often the simplest to build in technical terms as they require only short-range missiles and radars. However, terminal defenses also face the most difficult targets, the multiple warheads and decoys released during the post-boost phase. In contrast, boost-phase defenses are difficult to build because they have to be located close to the target, often in space, but every success destroys all of the warheads and decoys.

ICBM on Wikipedia