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Is Rockwell still in business anymore, at least as an aviation company?
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Rockwell Collins still makes avionics and communications equipment, but the Rockwell that was formerly North American and that built the B-1 and the space shuttle was absorbed by Boeing in the 1990s.
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It still amazes me that the B52 is still flying and hasn't been replaced, or at the very least undergone engine modernization to save fuel.
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With it's capability as a standoff cruise missile platform, it's still very effective. There is talk of them flying until 2040 (almost 90 years in service?). They've been talking about re-engining them for at least 25 years now, but I don't think it's going to happen. It will probably cost more than it will probably save. The B-52Hs, which are the only model left, were the most fuel efficient of the bunch.
Plus, the B-52 is huge benefit as far as psy-ops. I remember when Desert Storm was starting, one of the guys on TV said "The Iraqi forces are battle-hardened after their years of war with Iran." The military analyst next to him replied, "Yeah, but the Iranians weren't carpet bombing them with B-52s on a continual basis."
That's the other great thing about the B-52; as a conventional platform carrying Mk-82 dumb bombs, it doesn't use precision guided munitions because it doesn't have to. Just draw a box and everything within that box will be obliterated.
And that's why it remains a significant weapon capability from a psy-ops point of view.