In how to tell a true war story what does o'brien compare war to?

O’Brien prefacesvthis story by

i don’t know your in college god damit

many battles and wars (such as the one at gettysburg), are commemorated by statues or monuments, with some areas preserved as monuments and national parks. do you think this contradicts the message of "grass"? in at least 200 words, explain your thinking and cite evidence from the poem to support your opinion.