Hi, I'm so sorry, but I have Skinner Vietnam questions for you this afternoon! XD
Do you have an estimate of what year(s) he was in Vietnam?
I don't like to have logical discrepancies in my work, such as him claiming he watched Jack Jones perform on the Ed Sullivan Show in 1963 if he was already overseas by then. The Simpsons Fandom Wiki is vague about the specific years of his enlistment. I feel like you'd probably have the best answer since you did such an amazing collection of his recollections recently!
Additionally, it seems the specific 3 years he was imprisoned in the Mekong Delta were after the Battle of Khe Sanh, so 1968, 1969, and 1970; but then, how much longer did he stay there before going home?
Would he have been among those liberated during the 1975 Fall of Saigon?
Sorry for the nerdiest questions of all time; feel free to ignore if this is too much! However, if you know the answer to any of these, I'll add it to the Simpsons Fandom Wiki!