Marines

The Marines (海軍, Kaigun) are the World Government's military sea force, and collectively serve as one of the longest-running antagonists of the series, alongside the Shichibukai, Baroque Works, CP9, and Blackbeard Pirates. They are present in all the seas around the world, although they maintain only a slight military presence in the four Blues by establishing branch offices. The focus of the bulk of their assets is on the far more dangerous Grand Line, as their main headquarters, Marineford, is located there. The Marine HQ was situated at Marineford, but after the time skip, it is situated in the New World.

Duties
The duty of the Marines is to maintain a law and order throughout the world and impose the will and might of the World Government. They are therefore considered the key strategic development force in the World Government and are expected to obey its orders at will. Sometimes these orders are questionable, however they are expected to carry them out regardless of opinion. Amongst their duties is awarding bounty hunters the bounties on the heads of a criminal. They tolerate bounty hunters as a method of making their job easier but are known to go out bounty hunting themselves. Apprehended criminals who are brought in alive are handed over to be made an example of, the Marines are left to ensuring the exportation of these criminals to prison and/or to their execution.

Marines often work in pairs with one superior officer and a second in command or subordinate who is of slightly low rank. These partnerships may remain even during promotions with both pairs advancing in rank together. In the pair the higher ranked officer will give the orders to the men under their command, while the other acts an adviser or information gatherer while ensuring their partners command is undertaken by the men.

Higher ranked Marines (Admirals and Fleet Admiral) are expected to be on call to lead the Marine forces into war. This may take form of apprehending many criminals at once, protecting the World Nobles or calling a Buster Call to tackle a situation. Vice admirals are the ones who serve on the ships that the Admirals call out and are tasked with carrying out the Admirals orders exactly.

The main purpose of the Marines remain footed in the idea of bringing justice to any criminal. They use justice as their constituted policy to manage a world that is made entirely of one ocean much easier. However, the main problem within the Marines is the approach to Justice. They are generally divided between those who support Moral Justice and those who support Absolute Justice with the latter being the code of conduct for the Marines as a rule. Nevertheless, there is little worry from the higher ranked Marines as to how the Justice is carried out so long as it is, leading those who truly support absolute justice to make unjustified actions in carrying out their duties.

The Marines are also aided by the Shichibukai in terms of maintaining the "Three Great Powers", and as such, are expected to cooperate when necessary. Despite this, several Marines, such as Smoker, Sengoku, and Kizaru think of the Shichibukai as no more than pirates. In turn, the Shichibukai have no obligations to obey the Marines unless under the direct orders of the World Government itself.

One of the most questionable parts of their "Justice" is when it comes to Slavery. Despite the action supposedly being abolished years before, it is often shown they just look the other way. Especially when it comes to the World Nobles' slaves, where it is even seen as a crime to free said slaves even if the person is merely a child. Often tasked to find and return the person to be a slave once again.

The New Age
Thanks to Blackbeard and the death of Whitebeard, a new age has begun upon the world and the "Age of Pirates" that Roger established has ended. It was noted that it was time for the Marines to change, however it is unknown how much change will occur to the Marine at this point.

Rank System
The system of military rank in place for the Marines is fairly straightforward, where each rank is clearly delineated.

Officers and recruits present at Marine Headquarters are considered "Super-elites". All ranks present from "Lieutenant" above are usually trained here, exceptions being those in command of other Marine bases which includes Axe-Hand Morgan and Nezumi.

Rank Insignia
The Marines do not have a system of rank insignia per se. There is significant variation in the kind of uniform worn by officers, with many opting to wear a variety of dress showcasing their own eccentric style. Marines are also allowed to wield whatever weapon they are most comfortable with, no matter how unusual it is. They are even free to fight bare-handed. However, as a general rule set down by the author, uniform guidelines are as follows:
 * Upon first entering the Marines, new recruits are given the standard uniform, consisting of a white short-sleeved shirt emblazoned with the Marine emblem, a simplified seagull with "MARINE" underneath it, on the back; a blue neckerchief; dark blue trousers; and a baseball cap with "MARINE" across the front. All officers at the rank of Seaman (一等兵 Ittōhei) and below wear this. The quasi-rank of "Zatsuyō" (雑用 Zatsuyō) adds the kanji 雑 Zatsu ("various" or "odds and ends") to the sleeves, and to the Marine emblem on the back.
 * Once an officer has reached the rank of Petty Officer (伍長 Gochō), he or she can choose from a number of different uniforms, including his or her personal clothes. Only those who really want to appear "sailor-like" will stay with a more traditional uniform.
 * Sailors at the rank of Ensign (少尉 Shōi) and above are allowed to wear the coat with "Justice" (正義 Seigi) on the back. This coat tends to be worn like a cape, draped over the shoulders with the arms not in the sleeves. It should be noted that the sleeves of these coats are often much longer than the wearers' arms.
 * For the rank of Lieutenant-Commander (少佐 Shōsa) and above, a suit worn underneath the "Justice" coat is the preferred attire.

There are, of course, exceptions: Jango and Fullbody wear their own clothes with the "MARINE" hat, despite holding the rank of "Seaman Recruit" (三等兵 Santōhei). This may have something to do with the exceptional circumstances by which both of these men were brought into their present situation, or it may simply be lenience on the part of their Captain, Hina.

Commissioned Marine Officers

 * Fleet Admiral (元帥)
 * Head of the Marines
 * Admiral (大将)
 * Governors of the Marines
 * Vice Admiral (中将)
 * Rear Admiral (少将)
 * Commodore (准将)
 * Captain (大佐)
 * Commander (中佐)
 * Lieutenant Commander (少佐)
 * Lieutenant (大尉)
 * Lieutenant Junior Grade (中尉)
 * Ensign (少尉)

Infantry and Sailor Division

 * Warrant Officer (准尉)
 * Master Chief Petty Officer (曹長)
 * Chief Petty Officer (軍曹)
 * Petty Officer (伍長)
 * Seaman First Class (一等兵)
 * Seaman Apprentice (二等兵)
 * Seaman Recruit (三等兵) or Recruit (新兵)
 * Chore Boy (雑用) (not official rank)

History
Exactly how long the Marines have been around for is unknown, so is how they were created.

The oldest known date of their existence is 1472 AOS when Oimo and Kashi were captured by the Marines and tricked into guarding Enies Lobby, hoping to free Dorry and Brogy, whom they thought had been arrested.

In 1500 AOS, Garp was known as the legendary Marine who cornered Gol D. Roger many times. After Roger's execution, the Marines and the Marine Judges went to Water 7 to judge and later execute Tom for supporting him in his pirate ventures by constructing Roger's ship, the Oro Jackson.

In 1502 AOS, a platoon of Marines, including five vice admirals, were sent to Ohara to execute a Buster Call regarding the research of lost history and annihilated the island. Three of the most notable vice admirals who took part included future admirals Kuzan and Sakazuki as well as Jaguar D. Saul, who sacrificed his life to protect the island.

After Marshall D. Teach had captured the second division commander of the Whitebeard Pirates, Portgas D. Ace to become a Shichibukai, with Ace's execution being announced, the Marines are preparing to have an all out war against the Whitebeard Pirates, which took place at Marineford. Alongside the Whitebeard Pirates came Monkey D. Luffy and a motley crew of Impel Down breakout convicts, and the war had escalated to its final phase after an hour and a half.

Upon Ace and Whitebeard's deaths, Shanks arrived to stop the war, and Sengoku agrees. With that, the world who despises pirates cheered on the Marines for their victory. However, Sengoku then finds out that several Level 6 prisoners of Impel Down escaped thanks to Blackbeard, and is even more furious when the World Government declares it to be covered up.

Shortly after the end of the war, Sengoku retired from his post as fleet admiral. The position was replaced at some point in the two years following the war, but his replacement has yet to be shown.

Early One Piece
According to One Piece Green: Secret Pieces, the Marines' original theme was supposed to be sort of Mafia-like. In the first version, marines were supposed to wear black suits instead of marine coats and every member was planned to have a hard, scary look on their faces. Also, minor marine characters like John Giant and Brandnew were already planned out from the beginning of the series.

Translation and Dub Issues
Although the literal roman characters "Marine" are displayed prominently throughout the manga on the hats and uniforms of officers and at military installations, the Japanese word that is used is "海軍" (かいぐん) "kaigun", which translates most closely to "Navy".

One of the reasons that Navy is the traditional English translation of the word "kaigun" is the close association that the Imperial Japanese Navy had with the British to the extent that bridge commands in the INS were even issued in English until shortly before WWII. As a result, Viz as well as 4Kids decided to translate it as "Navy". While Viz alters the various "kaigun" kanji to read Navy in English while leaving the word Marine alone on various equipment and personnel, 4Kids, on the other hand, took a different approach. 4Kids opted to erase kanji and to change all instances where the word "Marine" appears in the artwork to read "Navy". Conversely, FUNimation appears to take more of a middle ground. They appear to translate all of the Kanji literally as "Navy", a well as occasionally referring to the organization as a whole as the "Navy" while more often referring to the smaller groups and the grunts chasing them as "The Marines". Seemingly by the logic that the group as a whole are the "Navy" and the individual soldiers are "Naval-Marines".

In English, to call the Navy the "Marines" or the "Marine Corps" can be considered a mistake, because Marines (in the English sense of the word) only make up a portion of the Navy's forces. For example, in the American Military the word "Marine" is used to describe any member of a Marine Corps while a strictly seafaring force is called a Navy. Evidence from the series (specifically, the author's frequent use of vocabulary from a variety of mainland European languages) suggests that the use of "Marine" in the Navy's emblem may come from French or German. In both these language "Marine" has the same meaning as the English word "Navy".

Nevertheless, English speaking fans of the series generally accept either term, though some who are fans of the Japanese version (but do not actually speak Japanese) have been known to criticize the use of the word "Navy,". This is normally either as a knee-jerk reaction against the 4Kids dub of the Anime (which uses the term) or out of unawareness that the word "Navy" is a more proper translation of the term "Kaigun". In the end, it is important to remember while Navy or Marines can be used as the correct term for the group, using "Marine" as a direct English translation of the Japanese is incorrect.

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Marines 海軍