Someone calls them mercenaries. Some are soldiers of fortune and "wild geese". These people try not to advertise their activities, but if an armed conflict has flared up somewhere, there is no doubt that "dogs of war" from all over the world will immediately begin to reach this place.
The activities of mercenaries, as a rule, are illegal or semi-legal. They don't like mercenaries, because they earn their bread at the price of blood, mostly someone else's. There is an article in Russian legislation that provides for a prison term of up to 7 years for such work. There are similar articles in the legislation of many other countries. Nevertheless, the number of mercenaries is not decreasing, and many regimes eagerly resort to their services.
To become a mercenary, you must, at a minimum, own some kind of demanded military profession. Real combat experience is greatly appreciated. Many mercenaries know each other personally and keep in touch. Therefore, it is easy to get together when another conflict arises. A person without reputation, military profession and combat experience is usually not needed by anyone.
However, all mercenaries start somewhere. The easiest and worst option is to simply go to the next war illegally. If the newcomer is lucky and is not detained and imprisoned, he has a chance to get to the war region. Then he can only hope that he will be able to survive and gain the necessary experience. There is no need to talk about earnings in this situation, no one will pay such a person good money. Most likely, you will have to fight for food and lodging, and it's good if you can save something for the way back.
If the mercenary has a military profession and knows English, he has a chance to use the services of one of the foreign offices that recruit people to provide security services. For example, American Military Professional Resources Inc., Dyncorp or British Sandline International. You may be offered to work as a security guard in one of the third world countries, but it is quite possible that this is just a convenient cover and in fact you will have to take part in one of the local conflicts.
This option can be considered the most successful, since it will be possible not only to gain experience, but also to prove oneself in a certain way. Having proved himself well, a beginner can receive an invitation to the next contract. From this moment, his real career as a mercenary begins.
It is necessary to understand that mercenaries, as a rule, are attracted not by the money that they can get, but by the way of life peculiar to "wild geese". Most of them are simply not interested in the gray dull life from paycheck to paycheck, they prefer war to it. Many of them do not have families and do not create any illusions about their future, living in the present. It is unlikely that these people should be blamed, but there is no point in admiring them. Everyone in this world lives the way he can and how he wants.