Bill,
First of all I am not trying to beat a dead horse, but I don't think the Corps is for you, but we never know, only you will truly know. You will have to seriously evaluate your heart and mind before taking on this journey.
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First off, I know it will be tough- mentally, physically, and emotionally- and, after you read what I have to say, you may try to dissuade me from putting the effort into it. But I've been thinking and researching as much as I can about this idea, and if I were to join, Marines would be the only branch I'm interested in.
I want to say you have not done enought research if you are saying what you have said..... Yes, it will be mentally, physically, and emotionally tough. It comes down to whats in you heart and how bad you want to be a Marine. When I went to bootcamp I saw young guys that were built like an ox, physically in perfect shape, but did not have the mental strength to be a Marine. I cannot tell you or put into words how difficult that process was, simply because you have not experienced it. There were times when I wondered What the heck! I got myself into, but I never quit and three insane months later I was a part of the Few and the Proud. There is a reason for that motto, because not just any joe blow can be a Marine. You should know its a way of life...thats the best way to put it.
With that said I was a Corporal in the Marines. Ask any Marine on here and they will let you know that we are the backbone of our beloved Corps. I read your initial post several times because I want to give you an Honest and Fair answer because you mentioned you wanted to be an officer:
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I took a practice ASVAV online, and apparently scored in the 90th percentile- I want to say 97 or so, though I wouldn't be surprised if it was biased or a fake one.
The ASVAB does not mean anything once you go to Boot camp or OCS. I have met Marines that cannot tell you what 2+2 is, but they will blow your mind when it comes to being a Marine and a leader of Marines. I have also met Marines that were too smart for their own good, and would have gotten us killed had we been deployed with them. It comes down to what you are taught common sense, and how you use it.
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but my goal is to become an officer, preferably away from front line action.
You should know...as Capt Althaus said EVERY MARINE IS A RIFLEMAN. There is no job that will keep you from being in the front lines, as this metality is unacceptable to the Marines, kind of insulting actually. This is what makes us Marines. Yes we have our grunts, but even the Devil Dog doing Admin is a qualified Rifleman and can be pulled from that desk and expected to perform just like a grunt. Every Marine goes to the School of Infantry to do either the Infantryman training, or Marine Combat Training for lateral military occupations. As an officer it is even more important that you have this mental attitude. You will be put through Officer Candidate School "Ductus Exemplo" that is up to 12 weeks long, JUST to see if you are Officer Material. Afterwards you would be sent to TBS or The Basic School, which is up to 6 months long.
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I'm 23 years old, roughly 250lbs at about 6'1", with a bachelors degree in fine art in game art and design.
You mentioned that you were 6' 1" and 250 lbs. Again as my fellow Leathernecks have said, you are WAY out of regulation standards. You would need to lose about 80 lbs, your max allowed weight is 208 lbs, but that would still be way overweight in our eyes. I would recommend you take a year or so to get into shape. Before I joined I was part of the poolee program. The recruiters help you prepare for bootcamp months in advance. Remember you have to be able to run 3 miles in less than 27 minutes, do at least 3 pullups, and at least 45 crunches, and thats just the minumum. I can assure you that if an officer took a PT test with me and barely made the cut, I wouldnt want to follow him into the local Commissary, let alone a combat zone.
One thing many young men do in your position is to go Enlisted first, even with a degree, to get a taste of our side of the Corps. You then would have the choice of going to OCS after two years Enlisted. If you truly are dedicated to this, I would suggest this route.
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Normally, I wouldn't mind being front line in Iraq or Afghanistan, but my parents freak out, worrying about loosing life or limb, and I'd rather make things easier for them.
What I'm looking for here is some feedback on how I can get what I'm looking for in a Marine career- I'd like to be an officer, preferably on barracks or embassy duty- and how to deal with family.
Embassy duty is a privilege. You have to do your time before even being considered for this duty. I have several brothers that are Marine Security Guards. You get selected after you do your time in the fleet. I say this is a privilege because there are many Pros to doing this type of duty, and you are a direct representation of our Military everytime a foreigner steps into our Embassy, and you are the safeguard to that small piece of land on foreign ground. Only the best, most squared away Marines are allowed to do this duty.
Marine Officers are always taught to lead by example, and I will let you know that you will always be responsible for a group of Marines as an officer. Like the skipper said, the lives of those men and their well being is ultimately your responsibility, and unless you have ever held your men's lives in your hands or ready to, the Marines is deffinately not for you.
We as Marines don't want to discourage anyone who would show interest in becoming a Marine, because you do not know what it means until you receive your Eagle Globe and Anchor, but with what you have said and what you are looking for I think it would be better if you looked into another service UNLESS you are ready to change that mental thought process and accept the responsibilities that will be bestowed upon you as a Marine, Enlisted or Officer.
I understand the concern for your parents, but time to man the heck up. Its not about them, because they will not be sitting next to you with their sights down range making sure your ass is covered, they will NEVER know what its like to make sure your brother to the left and right are their main priority, not you.
The reenactment thing...

I can only say, until you see what a real round will do to someone...you have no clue, and that thing you call experience....you do not know the limits of a man until you have seen him fighting for his and his Marines life and that includes the enemy.
Your cousing got selected to pull this duty because he is a grunt. Only a platoon of men get selected for this, and it is a limited duty. Lets just say its like winning the powerball.
We are not trying to discourage you, but this isnt one of those "....ah lets see what happens" this is life and death. There is nothing I like to see more that Marines being born, so its not to say that you wouldnt make it, because those DI's will make you a Marine, IF you want it. YOu might decide to do it, and you might make it, and I guarantee you will look back on this post and laugh at it. "WTF was I thinking?!"
All we are really doing is watching your six, because your decisions as a Marine, more specifially as an officer, will affect many, many lives.
It all comes down to you.....
Semper Fi
PS If you think we are harsh...you REALLY dont want to meet a group of Drill Instructors, I promise.