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A few years ago, veteran employment was associated in the United States with the charity. Today both public administration and many private companies are willing to assist former soldiers. Within the next five years, about one million soldiers will have to leave the armed forces because of the planned partial withdrawal of the U.S. troops from Afghanistan and defense cuts. Most of them will find employment, however, a significant percentage, especially the young veterans of the Iraq and Afghanistan wars will remain unemployed. Veterans affairs are crucial both for the President of the United States, the Congress and the whole American society, as they are related to the economic and social aspects of the state functioning. On the other hand, misconception about ex-combatants prevents the use of their potential and skills acquired in the military, and is not reflected in any way on the economy of the state. This situation is frustrating because veterans can be very good workers having many qualities that are desirable among employers, such as leadership skills, cooperation, loyalty and initiative.

Terrorism is defined as use of unlawful violence or threat of unlawful violence to indulge fear; intended to coerce or to intimidate governments or societies in the pursuit of goals that are generally political, social or religious. Bioterrorism is terrorism by intentional release or dissemination of biological agents, mainly bacteria or viruses. Use of biological weapons is attractive from the terrorists' point of view because of low production costs, major range and easiness of transmission. The first mention of the use of primitive biological weapons date back to the 6th century. Use of plague-infested corpses as offensive means in the 14th century caused a spread of bubonic plague through the whole Europe. The biggest development of biological weapons took place in the interwar period and in the cold war era. Biological weapon trails and research were conducted by super powers such as USSR, UK, USA and Japan. At the beginning of the 20th century a new form of bioterrorism occurred, which put humanity in the face of a terrifying threat.

Yersinia pestis (formerly Pasteurella pestis) is a type of bacterium. It is believed to have been responsible for plagues of the early 1300s. More accurately, it is a Gram-negative rod-shaped coccobacillus. It is a facultative anaerobe that can infect humans and other animals. Human Y. pestis infection takes three main forms: pneumonic, septicemic, and bubonic plagues. All three forms are widely believed to have been responsible for a number of high-mortality epidemics throughout human history, including the Justinianic Plague of the sixth century and the Black Death that accounted for the death of at least one-third of the European population between 1347 and 1353. It has now been shown conclusively that these plagues originated in rodent populations in China. More recently, Y. pestis has gained attention as a possible biological warfare agent and the CDC has classified it as a category A pathogen requiring preparation for a possible terrorist attack. Every year, thousands of cases of plague are still reported to the World Health Organization, although, with proper treatment, the prognosis for victims is now much better. A five- to six-fold increase in cases occurred in Asia during the time of the Vietnam war, possibly due to the disruption of ecosystems and closer proximity between people and animals. Plague also has a detrimental effect on non-human mammals. In the United States of America, animals such as the black-tailed prairie dog and the endangered black-footed ferret are under threat from the disease.