Question

is nothing as bad as war. we in the auto - ambulance dont even realize at all how bad it is. when people realize how bad it is they cannot do anything to stop it because they are crazy. there are some people who never realize. there are people who are afraid of their officers. it is with them the war is made.
—ernest hemingway
a farewell to arms
hemingway states that war is made with

the officers
those who are afraid of the officers

the auto - ambulance

Explanation:

The quote from A Farewell to Arms explicitly states "It is with them the war is made" where "them" refers to the immediately preceding group: "people who are afraid of their officers".

Answer:

those who are afraid of the officers