The USA won the Vietnam War. Its people gave up the fight after the Tet Offensive was defeated. Militarily the Voetnamese forces in the South were largely finished. The US media and its liberals lost the will to finish. And as everyone here should know. If you leave the initiative to the enemy allowing them to strike where they want, you will always be on the defensive. A country called North Vietnam was supporting and supplying these so called "insurgents". Research the topic of the "Viet Cong". Long since it has been revealed the North's strategy was to insert a Division of troops into an area of the South. Setup a base of operations. Crush any dissent. And launch "guerilla" operations against the enemy. The Viet Cong are largely a mith as "home grown insurgents".

Was the USA defeated in Afghanistan or Iraq? Seems there was and is continuing to be a regime change. What were the objectives of the military action? Were they confused objectives or changed objectives over time? Infidels in Muslim lands seems to be a powerful motivator as time went by.

These insurgents, especially in early days were well funded. By who? Same as funds them still today. The Middle East is a mess.