By any definition some challenge articles certainly became canon later. The target list in the Big yellow book (and Howling Wilderness) was in one of the first few challenge articles (along with the USSR and Canadian lists IIRC).
I honestly don't care about canon but I think if an article was written by one of the original creators/authors it would probably be canon. Actually if I am remembering correctly only the last challenge T2k article ("Rockets Red Glare"?) was a pure fan submission (and I choose to fully ignore it). I believe the rest were either by GDW staff or commissioned articles.
Edit Added howling wilderness reference. As that would make the challenge article both v1 and v2 canon.
Last edited by kato13; 12-13-2017 at 10:04 PM.
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