Yes, post the publication date.
It's one thing to remember exactly every word said on an arbitrary date in a hectic time of one's young life, on a date that happened half a century ago. It's another to paraphrase, or pick a similar saying that conveys the same meaning but wasn't the exact words used at the time.
Heck, there are several WW2 pilot-authors that don't have their facts straight, as has been reported by several members of this forum. Who's to say he wasn't sitting there trying to remember what happened, then just phrased it in his words *now* about how he was feeling *then*.