Dave Cockrum sent me the following:
I just remembered--Blackhawk SORT OF made an appearance in the X-Men. Issue #158 involves a storyline where Wolverine, Storm and Carol Danvers go into the Pentagon to erase files on the X-Men. In one panel there's a long shot of them walking down a looong corridor. Wolverine is looking back at someone walking past in a cross corridor. I drew in Blackhawk. Chris Claremont covered him with a word balloon, but you can still see his legs and boots.
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