Originally Posted by
Marvel Wars
From the mini serie History of the Marvel Universe:"To accommodate for the passage of time, some Marvel Universe references of character involvement in the Vietnam War have been retroactively refitted to be the Sin-Cong Conflict; the Vietnam War remains a world event that took place from 1955-1977 in the Marvel Universe as well as it did in reality. Therefore, due to the retroactive continuity, some in-story presentations of Marvel characters in the Vietnam War should be considered a depiction of the Sin-Con Conflict."