chemical substances to incapacitate or kill enemy combatants. Chemical warfare nerve agents are potent anticholinesterase compounds deliberately formulated to induce debilitating effects or death during wartime hostilities. A key need for both community emergency preparedness, and restoration of military installations where agents have been processed and/or stored, is access to concise and timely information on agent characteristics and treatment, as well as health-based exposure guidelines derived in a clear manner by contemporary methods of data analysis. Electronic Electronic warfare refers to mainly non-violent practices used chiefly to support other areas of warfare. The term was originally coined to encompass the interception and decoding of enemy radio communications, and the communications technologies and cryptography methods used to counter such interception, as well as jamming, radio stealth, and other related areas. Over the later years of the 20th century and early years of the 21st century, this has expanded to cover a wide range of areas: the use of, detection of and avoidance of detection by radar and sonar systems, computer hacking, etc. Fourth generation Fourth generation warfare (4GW) is a concept defined by William S. Lind and expanded by Thomas X. Hammes, used to describe the decentralized nature of modern warfare. The simplest definition includes any war in which one of the major participants is not a state but rather a violent ideological network. Fourth Generation wars are characterized by a blurring of the lines between war and politics, combatants and civilians, conflicts and peace, battlefields and safety. While this term is similar to terrorism and asymmetric warfare, it is much narrower. Classical insurgencies and the Indian Wars are examples of pre-modern wars, not 4GW. Fourth generation warfare usually has the insurgency group or non-state side trying to implement their own government or reestablish an old government over the one currently running the territory. The blurring of lines between state and non-state is further complicated in a democracy by the power of the media. Ground Ground warfare involves three types of combat units: infantry, armor, and artillery. Infantry in modern times would consist of mechanized infantry and airborne forces. Usually having a type of rifle or sub-machine gun, an infantryman is the basic unit of an army. Armored warfare in modern times involves a variety of armored fighting vehicles for the purpose of battle and support. Tanks or other armored vehicles (such as armored personnel carriers or tank destroyers) are slower,