most embarrassing war
Lol, no. Afghanistan takes the cake. No reason at all to invade in the first place, then get picked off and scammed by goat herders for two decades, then get actively kicked out by said goat herders, all while being a century ahead of them in technology and having unlimited money to fight with. The Viet Cong were at least smart and civilized people, fighting with Chinese and Soviet weapons of a similar level as the Americans.