But didn't you win WW2 ?

Afghanistan’s acting defense minister, General Bismillah Mohammadi, slammed the fleeing president Ashraf Ghani in a brief tweet Sunday, writing: “They tied our hands behind our backs and sold the homeland, damn the rich man and his gang.”

One Taliban security official said there was a “peaceful handover of government facilities ongoing across the country.” Another spoke briefly in English to say that he had formerly been held by the US in Guantanamo, a claim that CNN cannot independently verify.

QUESTION
What if a few Americans are captured in Afghanistan and the Taliban demand that all in Guantanamo Bay must be released immediately?

Wars are not a fucking sporting event where 2 opponents square off for a set time with a tangible scoring system, they are much more grey in their outcomes. With Korea, I don't see how we lost. The outcome was not allowing communism to overrun the entire peninsula and it allowed the creation of a very prosperous and peaceful South Korea, What has happened to North Korea was their own doing. To 'win' outright in Korea would have required nuking China and that wouldn't have been a win for anybody.
Same with Vietnam, what was the ultimate outcome? A stable, peaceful, friendly country. There again to win outright would have required a nuclear confrontation with the Soviet Union and China.
As for the Middle East, that situation is still to fluid to declare any type outcome and we may very well not be completely done militarily over there, only time will tell.
But I totally applaud Joe Biden, for having the guts to do what needed to be done at this time. As for the ultimate outcome there, only time will tell. But I will predict that it will be way different from what most are predicting, most humans tend to have their thinking very rooted in the past.

It must be great to wallow in generalizations 24/7/365

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Superior technology and numbers do not guarantee victory. Yet too many generals believe it does.
Nearly 700 years ago the French had superior technology (the crossbow) and vastly superior numbers, including a huge number of aristocratic cavalry, the fast moving "tanks" of their day.
Facing them was an army a quarter of their size, mainly on foot, and with only a limited cavalry. It also had many foot-soldiers armed with the "primitive" longbow.
The crossbow had tremendous accuracy and hitting power. The Magnum of its day.
The longbow needed hours of practice to achieve accuracy, but crucially its arrows flew, giving it twice the range of the crossbow, and it was also faster to reload.
The battle of Crecy went against all expectations. The English archers first assaulted the out of range crossbow men, until they eventually fled. The archers then turned their attentions to the French cavalry as they attacked, reducing their numbers considerably. There was wave upon wave of cavalry attacks, but the English repulsed them again and again, with the archers wreaking havoc upon them. It was a resounding victory for dedicated soldiers, on foot, and the previously despised longbows of the Welsh and English archers.
Later, the French king gave orders that any English longbowmen who were captured had to have the index and middle fingers of their right hand amputated, to ensure they could never again shoot. This gave rise to the taunt still in use today of raising these two fingers, slightly apart as though on a bow string, and inviting the enemy to come and get them - if they could!!
It is not a crude gesture, as some people believe.

The winners and losers of wars are not countries, they're individuals, and I'd be willing to bet for every single war you say America lost there were Americans who won.