All were part of U. S. war efforts in Vietnam, except ? ( NEED ASAP !)

1 ) Use Of Agent Orange

2 ) Use Of Attack Helicopters

3 ) Use Of Nuclear Weapons

4 ) Use Of Napalm

3) Use of Nuclear Weapons

Explanation:

Although the U.S didn't use nuclear weapons they got very close to using it.

The U.S did use the other tactics though. They were very effective.

i dont no the claim so it's hard to answer but i think he would go to the people to decide. : ) ; )