If you trace back through history, the Marine corps was formed for only one purpose and one job, which was basically to protect U.S. interests by providing security. As history goes on, the sole purpose of Marine Corps is to win battles which could only mean infantry, or riflemen.
There is a saying, Marine Corps was born on America's need for wars, this branch of military is not created because people needed it, it was because people wanted it. And with years of wars throughout America's history it was only apparent that Marine Corps is an very effective war machine. Such the reason as to why all Marines are basic riflemen unlike other branches where if you are any MOS other than infantry, you definitely won't receive as much field training.
So you can read all about USMC history, but as to the your question about what is a Marine's primary role; a rifleman, a damn proud rifleman. (You can ask any Marine that and he'll tell you pretty much the same)
P.S: modern difference of a rifleman and infantry, when the sh** hits the fan, every Marine is a capable rifleman.
This is my rifle…
There are many like it, but this one is mine.
My rifle is my best friend. It is my life. I must master it as I must master my life.
My rifle, without me, is useless. Without my rifle, I am useless. I must fire my rifle true. I must shoot straighter than my enemy who is trying to kill me. I must shoot him before he shoots me. I will…
My rifle and myself know that what counts in this war is not the rounds we fire, the noise of our burst, nor the smoke we make. We know that it is the hits that count. We will hit…
My rifle is human, even as I, because it is my life. Thus, I will learn it as a brother. I will learn its weaknesses, its strength, its parts, its accessories, its sights and its barrel. I will ever guard it against the ravages of weather and damage as I will ever guard my legs, my arms, my eyes and my heart against damage. I will keep my rifle clean and ready. We will become part of each other. We will…
Before God, I swear this creed. My rifle and myself are the defenders of my country. We are the masters of our enemy. We are the saviors of my life.
So be it, until victory is America’s and there is no enemy, but peace!
This question has been answered several times, so I'm not going to answer it I'm going to give one of my stories.
I was a Marine Reservist with an MS of 0811 (artillery). When the war in Iraq kicked off, my unit was not slated to deploy for several years. That was unacceptable for me. I wanted to help. I wanted to fight.
So I agreed to be an individual augmentee. This means I signed a short contract that said I was willing to be deployed with any unit that would take me. After a month or so I received a call saying that 3rd CAG (civil affairs group) needed bodies and I was to report to camp pendleton for assignment with that unit. I went and received a few months of pre-deployment work up training and then we went to iraq.
The first month or so was acclimatization in Kuwait and then going to RamadI and doing my job. My job was PSD (personal security detail) for a Lt. Colonel. His job was meeting with Iraqi leaders and paying money to them for damage caused by the war. This was a good job but entailed maybe 2 missions a week. This caused a lot of downtime and as the saying goes "idle hands do the Devils work".
I had lots of time to meet others in and around our camp and made friends with a few army infantry types that went on night patrols and raids. It didn't take long for me to bring up the idea of going with these units to my boss, Lt. Col. "Money". His response was, "OK, so long as you are able to still go on CAG missions".
So here I was a lone Marine gearing up with a platoon of Army Soldiers to assist them in their missions. Without going into any detail about the missions, it didn't take long for the Army officer-in-charge to put me with his point/assault team. This lasted for the rest of my deployment, over 150 missions with this Army unit. I was also able to go on my 2 missions a week with my unit.
The moral of this story is, I was able to become a very good "soldier" in a little amount of time. Even though I was a reserve artillery guy and these were active duty Army infantry. Now, this isn't to downplay or talk bad about the Army soldiers I went on missions with. They were good at what they did. This is just to point out that a Marine "rifleman" POG has enough training to hold his own and possibly excel in a combat zone as an infantryman.
I would never talk bad about anyone in the Army, so please don't go there in the comments. My father was 101st in Vietnam, one brother was a Sniper with an Army unit, and my youngest brother was with the 75th Ranger Bat. So I'm the oddball of the family.
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