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t. e. Tower defense ( TD) is a subgenre of strategy games where the goal is to defend a player's territories or possessions by obstructing the enemy attackers or by stopping enemies from reaching the exits, usually achieved by placing defensive structures on or along their path of attack. [1]
Federal government of the United States. The Strategic Defense Initiative ( SDI ), nicknamed the Star Wars program, was a proposed missile defense system intended to protect the US from attack by ballistic strategic nuclear weapons. The concept was announced in 1983, by President Ronald Reagan, [1] a critic of the doctrine of mutual assured ...
An observation post for airfield defense coordination. An observation post (commonly abbreviated OP ), temporary or fixed, is a position from which soldiers can watch enemy movements, to warn of approaching soldiers (such as in trench warfare ), or to direct fire. In strict military terminology, an observation post is any preselected position ...
Operation Sky Shield. Operation Sky Shield, properly Exercise Sky Shield, [1] was a series of three large-scale military exercises conducted in the United States and Canada in 1960, 1961, and 1962 by NORAD (North American Air Defense) Command and CONAD (Continental Air Defense) Command to test defenses against an air attack from the Soviet Union.
Tour Total. / 48.89278°N 2.24306°E / 48.89278; 2.24306. Tour Total (previously known as Tour Elf from 1985 to 1999, then Tour TotalFinaElf from 1999 to 2003) is an office skyscraper located in La Défense, Courbevoie, the high-rise business district west of and adjacent to the city of Paris, France, designed in the Modern ...
NATO Joint Military Symbology is the NATO standard for military map symbols. Originally published in 1986 as Allied Procedural Publication 6 ( APP-6 ), NATO Military Symbols for Land Based Systems, the standard has evolved over the years and is currently in its fifth version (APP-6D). The symbols are designed to enhance NATO 's joint ...
Opposing force. An opposing force (alternatively enemy force, abbreviated OPFOR or OpFor) is a military unit tasked with representing an enemy, usually for training purposes in war game scenarios. The related concept of aggressor squadron is used by some air forces. At a basic level, a unit might serve as an opposing force for a single scenario ...
This is a list of chess openings, organised by the Encyclopaedia of Chess Openings (ECO) code classification system. The chess openings are categorised into five broad areas ("A" through "E"), with each of those broken up into one hundred subcategories ("00" through "99").