Thanks for sparing me the need to go look that up! I think the precise rule was specifically brought in as a response to the war of 1967 (although it was particularly directed at Sinai I think). Or to put this differently, Wendell, would the US have been justified in annexing Iraq in 2003?
The U.S. would have no reason to annex Iraq nor any desire to do so, regardless of what facets of international law have to say on the matter.