Mercenary
The vast majority of the men who trained in these camps were white men who saw para-military training as a "reverse the previous twenty years of American history and take back all the symbolic territory that has been lost" as the possibility of becoming mercenaries gave them "the fantastic possibility of escaping their present lives, being reborn as warrior and remaking the world".
Owing to the legal problems posed by the Boland amendments, the Reagan administration turned to the self-proclaimed mercenaries to arm and train the Contra guerrillas. In 1984, the CIA created the Civilian Military Assistance (CMA) group to aid the Contras. The CMA were led by a white supremacist from Alabama named Tom Posey, who like all of the other members of the CMA were graduates of the mercenary training camps. John Negroponte, the American ambassador to Honduras, arranged for permission to be given for the CMA to operate from Honduran territory. However, the operation collapsed later in 1984 when the Nicaraguans shot down a CMA plane carrying arms to the Contras, killing two Americans. Sam Hall, a self proclaimed mercenary hero and "counter-terrorist" who joined the CMA entered Nicaragua with the aim of performing sabotage operations. In 1986, Hall was captured by the Sandinistas, who held him for four months before releasing him under the grounds that he was not a mercenary, but rather a mercenary imposer. John K. Singlaub who worked alongside Hall described him as suffering from a "Walter Mitty type complex".

Colombia: In 1994, President César Gaviria of Colombia signed Decree 356, which allowed wealthy landowners to recruit private armies of their own and liberalised the law on settling up PMCs in order to fight the Communist FARC (Fuerzas Armadas Revolucionarias de Colombia – Revolutionary Armed Forces of Colombia) guerrillas. As a result of Decree 356, by 2014 Colombia had 740 PMCs operating, more than anywhere else in the world. Increasingly Colombian mercenaries have been hired by American PMCs as being cheaper than American mercenaries. The government of the United Arab Emirates has hired Colombian mercenaries to fight its war in Yemen.

Africa: 

Ancient Africa: An early recorded use of foreign auxiliaries dates back to ancient Egypt, the thirteenth century BC, when Pharaoh Ramesses II used 11,000 mercenaries during his battles. A long established foreign corps in the Egyptian forces were the Medjay—a generic term given to tribal scouts and light infantry recruited from Nubia serving from the late period of the Old Kingdom through that of the New Kingdom. Other warriors recruited from outside the borders of Egypt included Libyan, Syrian and Canaanite contingents under the New Kingdom and Sherdens from Sardinia who appear in their distinctive horned helmets on wall paintings as body guards for Ramesses II. Celtic mercenaries were greatly employed in the Greek world (leading to the sack of Delphi and the Celtic settlement of Galatia). The Greek rulers of Ptolemaic Egypt, too, used Celtic mercenaries. Carthage was unique for relying primarily on mercenaries to fight its wars, particularly Gaul and Spanish mercenaries.

19th and 20th centuries: In the 20th century, mercenaries in conflicts on the continent of Africa have in several cases brought about a swift end to bloody civil war by comprehensively defeating the rebel forces.  There have been a number of unsavory incidents in the brushfire wars of Africa, some involving recruitment of European and American men "looking for adventure". 
Many of the adventurers in Africa who have been described as mercenaries were in fact ideologically motivated to support particular governments, and would not fight "for the highest bidder". An example of this was the British South Africa Police (BSAP), a paramilitary, mounted infantry force formed by the British South Africa Company of Cecil Rhodes in 1889–1890 that evolved and continued until 1980.
Famous mercenaries in Africa include:

Frederick Russell Burnham was an American scout for the British South Africa Company who served in both the First Matabele War (1893–94) and the Second Matabele War (1896–97). He effectively ended the Second Matabele War by assassinating the Ndebele religious leader, Mlimo, but Burnham is best known in this war for teaching American Frontier scouting to Robert Baden-Powell and inspiring him to found the boy scouts. In the Second Boer War (1900–1904), Burnham served as Chief of Scouts to the British Army. He was presented the Cross of the Distinguished Service Order for his heroism and given a commission as Major in the British Army by King Edward VII personally even though he declined to renounce his American citizenship. Burnham's real-life adventures also heavily influenced H. Rider Haggard who created the fictional Allan Quatermain adventurer, a character who later was transformed by George Lucas into Indiana Jones.
Mike Hoare was a British career soldier who served with distinction in the London Irish Rifles during World War II. He later emigrated to South Africa, and was contracted by the State of Katanga in the early 1960s to form "4 Commando (Force Katangaise)", a unit of foreign military advisers in the local gendarmerie. Most of Hoare's recruits were Belgians or South Africans. After Katanga's integration in 1963, Hoare remained active in Congo affairs. He was solicited by General Joseph-Desiré Mobutu in 1964 to form "5 Commando" – a second mercenary force raised to crush the Simba Rebellion, which included European adventurers of at least twenty nationalities. Hoare later resurfaced in 1981, shortly after France-Albert René's ascension in the Seychelles, attempting to carry out a coup d'état on behalf of former president James Mancham. His troops were intercepted shortly after debarking on Mahé and only escaped by hijacking an Air India Boeing, which they flew to Durban.
Bob Denard was a former French intelligence operative, policeman, and dedicated anti-communist who saw action during the First Indochina War and Algerian War of Independence. After a brief inroad into civilian life, Denard returned to military service with the Katangese gendarmerie in 1961. Refusing to surrender when secessionist forces collapsed in January 1963, he disappeared into Angola with a nucleus of other die-hards and sought work training North Yemen royalists before returning to the Congo at the request of then-Prime Minister Moise Tshombe. Denard formed his own unit to fight the Simba Rebellion, les affreux, who were also instrumental in suppressing an attempted coup d'état in 1966. Dismissed by Congolese president Joseph Kasa Vubu, the French mercenary joined the Kisangani Mutinies and was wounded in action. He later went on to serve as a military adviser to several African governments, including Gabon and Rhodesia. Denard has since carried out five attempted coup d'etats in Benin and the Comoros Islands, three of them successful.
Neall Ellis was a South African aviator who achieved prominence for his extensive action in Sierra Leone's long-running civil war. Ellis was raised in Bulawayo, Rhodesia (Zimbabwe), but after an unsuccessful career in the Rhodesian Army, emigrated to join the South African Air Force. During the South African Border War, he flew improvised Aérospatiale Alouette III and Atlas Oryx gunships over Angola and Mozambique in support of South African expeditionary forces conducting external raids. He retired a colonel upon the end of apartheid, piloting Yugoslav Mil Mi-8s as an operational freelancer. In 1998, Ellis returned to participate in the Angolan Civil War with private military firm Executive Outcomes, which eventually dispatched him to Sierra Leone. During the Battle for Freetown, he was instrumental in fighting off Revolutionary United Front insurgents from a Mil Mi-24 Hind and providing air support for British forces executing Operation Barras. He has founded his own paramilitary company, Jesa Air West Africa, and continues to fly helicopters for Iraq and Somalia.
Simon Mann was found guilty in Zimbabwe of "attempting to buy weapons" (BBC 27 August) allegedly for a coup in Equatorial Guinea in 2004 (see below).

Congo Crisis: The Congo Crisis (1960–1965) was a period of turmoil in the First Republic of the Congo that began with national independence from Belgium and ended with the seizing of power by Joseph Mobutu. During the crisis, mercenaries were employed by various factions, and also at times helped the United Nations and other peace keepers.
In 1960 and 1961, Mike Hoare worked as a mercenary commanding an English-speaking unit called "4 Commando" supporting a faction in Katanga, a province trying to break away from the newly independent Congo under the leadership of Moïse Tshombe. Hoare chronicled his exploits in his book the Road to Kalamata.
In 1964, Tshombe (then Prime Minister of Congo) hired Major Hoare to lead a military unit called "5 Commando" made up of about 300 men, most of whom were from South Africa. The unit's mission was to fight a rebel group called Simbas, who already had captured almost two-thirds of the country.