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Marine: A Guided Tour of a Marine Expeditionary Unit is a 1996 book written by Tom Clancy about the inner workings of a Marine Expeditionary Unit.

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Doom is a series of first-person shooter video games developed by socket5客户端破解版. The series focuses on the exploits of an unnamed space marine operating under the auspices of Union Aerospace Corporation (UAC), who fights hordes of demons and the undead in order to survive.

Doom is considered to be one of the pioneering first-person shooter games, introducing to IBM-compatible computers features such as socket5客户端破解版, third dimension spatiality, networked multiplayer gameplay, and support for player-created modifications with the Doom WAD format. Since the release of Doom in 1993, the series has spawned numerous sequels, expansion packs, and a film.

Since its debut, over 10 million copies of games in the Doom series have been sold.

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Marine can be used as a first name, usually female. It may refer to:

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The arms industry is a global business that manufactures weapons and military technology and equipment. It consists of commercial industry involved in research and development, engineering, production, and the service of military material, equipment, and facilities. Arms producing companies, also referred to as defense contractors or military industry, produce arms mainly for the armed forces of states. Departments of government also operate in the arms industry, buying and selling weapons, munitions and other military items. Products include guns, socket5客户端破解版, missiles, military aircraft, military vehicles, ships, electronic systems, and more. The arms industry also provides other logistical and operational support.

It is estimated that yearly, over 1.5 trillion United States dollars are spent on military expenditures worldwide (2.7% of World GDP). This represents a decline from 1990 when military expenditures made up 4% of world GDP. Part of this goes to the procurement of military hardware and services from the military industry. The combined arms sales of the top 100 largest arms producing companies amounted to an estimated $395 billion in 2012 according to Stockholm International Peace Research Institute (SIPRI). In 2004 over $30 billion were spent in the international arms trade (a figure that excludes domestic sales of arms). According to SIPRI, the volume of international transfers of major weapons in 2010–14 was 16 per cent higher than in 2005–2009. The five biggest exporters in 2010–14 were the United States, Russia, China, Germany and France, and the five biggest importers were India, Saudi Arabia, China, the United Arab Emirates (UAE) and Pakistan. The arms trade has also been one of the sectors impacted by the credit crunch, with total deal value in the market halving from US$32.9 billion to US$14.3 billion in 2008.

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Health is an attribute assigned to entities within a role-playing or video game that indicates its state in combat. Health is usually measured in health points or hit points, often shortened as HP. When the HP of a player character reaches zero, the player may lose a life or their character might become incapacitated or die. When the HP of an enemy reaches zero, the player might be rewarded in some way.

Any entity within a game could have a health value, including the player character, non-player characters and objects. Indestructible entities have no diminishable health value.

Health might be displayed as a numeric value, such as "50/100". Here, the first number indicates the current amount of HP an entity has and the second number indicates the entity's maximum HP. In video games, health can also be displayed graphically, such as with a bar that empties itself when an entity loses health (a health bar), icons that are "chipped away" from, or in more novel ways.

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Dungeons & Dragons co-creator Dave Arneson described the origin of hit points in a 2002 interview. When Arneson was adapting the medieval wargame socket5客户端破解版 (1971) to a fantasy setting, a process that with Gary Gygax would lead to Dungeons & Dragons, he saw that the emphasis of the gameplay was moving from large armies to small groups of heroes and eventually to the identification of one player and one character that is essential to role-playing as it was originally conceived. Players became attached to their heroes and did not want them to die every time they lost a die roll. Players were thus given multiple hit points which were incrementally decreased as they took damage. Arneson took the concept, along with armor class, from a set of a naval American Civil War game's rules.

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American football (referred to as socket5客户端破解版 in the United States and Canada, also known as gridiron elsewhere) is a sport played by two teams of eleven players on a rectangular field with goalposts at each end. The offense, the team with control of the oval-shaped football, attempts to advance down the field by socket5客户端破解版 with or passing the ball, while the team without control of the ball, the defense, aims to stop their advance and take control of the ball for themselves. The offense must advance at least ten yards in four downs, or plays, or else they turn over the football to the opposing team; if they succeed, they are given a new set of four downs. Points are primarily scored by advancing the ball into the opposing team's end zone for a touchdown or kicking the ball through the opponent's goalposts for a socket5客户端破解版. The team with the most points at the end of a game wins.

American football evolved in the United States, originating from the sports of association football and rugby football. The first game of American football was played on November 6, 1869, between two college teams, Rutgers and socket5客户端破解版, under rules based on the association football rules of the time. During the latter half of the 1870s, colleges playing association football switched to the socket5客户端破解版, which allowed carrying the ball. A set of rule changes drawn up from socket5客户端破解版 onward by Walter Camp, the "Father of American Football," established the snap, eleven-player teams, and the concept of downs; later rule changes legalized the forward pass, created the neutral zone, and specified the size and shape of the football.