Mercenaries - 4th Generation Warfare

Employ mercenary groups to fortify your national armed forces with battle-hardened professionals. You can also carry out "unofficial" military operations without being held directly responsible by international bodies. But be careful: if you are discovered to be the one giving the orders, it could be disastrous for you.
Violent and feared by all, mercenaries are highly effective in combat. They are equipped with air transport and armored vehicles.

A dozen mercenary groups from various countries can sell you their services in an official capacity or in secret...