This part of the poem about America's involvement in the war.
The major theme of the poem is war and it's drastic effects.
The poem is about the war that happened between America and Vietnam. The given excerpt is the second stanza of the poem.
The words and phrases such as "deputies' rifles practicing their aim on stray dogs", "smells of the human body", and "curses of the soldier as he poisons, burns, grinds, and stabs", are used in the stanza that depict the scenario of war and the destruction it causes.
Thus, this part of the poem about America's involvement in the war.
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