Exactly, the Vietcong was a formidable foe, not only fearless, but also very clever.I love military type eyewear...I only wear SI M Frame 3 now........Vietnam was also a brutal insurgency war....very hard to win those.
The 2nd iraqi and the afghan war was the same with a fearless enemy, but the enemy here was/are far from the intelligence level of the Vietcong.
Of course we also have to remember the VC was supported by China and the Soviet Union ! Lots of intel coming from those two countries.