Are you aware that LBJ would not allow US troops to go into Laos or Cambodia where we knew the NVA were setting up command posts and weapons cashes for staging attacks into the South from along the Ho Chi Minh Trail?  Were you aware that when he started bombing in the North, the Russian ships unloading weapons and equipment to the North Vietnamese were "off limits?"  Are you aware that he didn't allow any ground troops to enter North Vietnam?  Or that against the advice of most generals, he put Westmoreland in charge because he wanted to use the strategy of "attrition," something the US military had never done, which assumes that if we kill enough of them, they'll eventually give up.  It's that decision that got so many people killed.  He was sending our ground troops into jungles where the enemy had the advantage of concealment as "bait" so when they ambushed our guys, we'd take them out with artillery and air strikes.  If we killed 10-1, we won.

Worst strategy ever used in a war.