The basic weapon of an American soldier in Vietnam was the
'rifle.

i dont understand what you were asking but i looked it up and found that One of the most common infantry weapons used by U.S. troops in Vietnam was the M-60 machine gun

Explanation:

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.