Yeah I didn't even recognize it either. I never followed Captain America-related storylines much at all.

If it's a trigger phrase for something conditioned, that raises the interesting (to me) possibility that there was no magic at all involved in the project that created the revenant Fubuki! Perhaps "all" Earthgov has done is raise the wreck, patch it up with questionably-well understood Fog tech up to and including a Mental Model (probably not running on a Union Core, though, but rather some off-the-shelf droid brain that they're comfortable with) and insert some hard-coded imperatives.

The supernatural consequences for the spirit of the ship (whom they don't believe exists), presently living the good afterlife in the halls of the honored dead (which they also don't believe in, probably), are, in this theory, entirely down to Corwin deciding to meddle.