It's a typo. It should read "is" (or "it is").
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I didn't know the second way and I've never seen suc
it is the mission (of the fleet) to retaliate against the U.S.S.R. -> ... fleet of 316 b-52s, whose mission it is to retaliate against the U.S.S.R.
The second one adds a bit of emphasis, and makes the mission seem like a bigger deal.
park sang joonI'd like to know whether this usage is, you think, the like of the structure "It is that~".Yes, I guess it's broadly similar.
The second big immediate decision, which could well be announced simultaneously with or even before the MX program, might seem easier, since its cost is less and it entails no environmental problems. But it is four months overdue. Weinberger initially expected to reveal in March what sort of intercontinental manned bomber the U.S. would build to replace its aging fleet of 316 b-5