In your view, what is the most important agency/department for Australian national security, and why?

FIRST read the files that i uploaded. and use some of them as reference. use oxford style and footnote. stay with the word limit. you should adhere to the same principles as writing your essay assignment; there should be an introduction, main body, and conclusion. We are not looking for policy writing, opinion pieces, or dot points! Obviously, you don\’t have a lot of words, so don\’t spend too much time on the introduction and conclusion, but just make sure it sets out, summarizes well what you will/have argued. please read the file i have uploaded. PLEASE use them for referencing as well. i want a really HQ essay, Please make a clear argument and back it up.