Hello, This should make for an interesting speech! It looks like you already have some ideas about what to include in your outline, but maybe you are struggling with how to begin or what order to put things in.
The first Roman numeral in an outline should be an introduction. Then you must letter the points you want to make in your introduction. That will look like this:
What should those points be? An introduction should tell your audience what the speech is about, should have something to gain the audience's interest, and should give the audience a little preview of what you will be talking about. That would be three points right there.
How should you organize the content of your speech? One way is to start with the general idea and then work down to the specific idea, that this is the career you are interested in. By starting with the general idea, I mean that you can start with some information about the Marines. What is their history? What is their mission? How are they different from the other branches of the military? That could be Roman numeral II, with points for each topic that discusses the background of the Marines.
Then you can begin to narrow your topic in Roman numeral III. Start discussinng the specifics of your career choice. What does it take to become a Marine?
You could also develop a new section to explain why you want to become a Marine, and perhaps a section to bring the Marines up to date. What are they doing now in Iraq, for example, or in Afghanistan?
Finally, your last Roman numeral should be a conclusion, a way to close the speech. Give the audience a review of what you just said and finish up.
I do not know how long your speech is supposed to be, but before you give the speech, be sure to practice and time yourself.