How many corporations have the GDP of a small country? What if corporations could fight wars themselves? They could with drones. I read somewhere that in Mex

How many corporations have the GDP of a small country? What if corporations could fight wars themselves? They could with drones. I read somewhere that in Mexico, there's a big oil reserve. However corporations are unwilling to tap it because of the cartels, and the dangers they provide. Imagine the slippery slope if BP decided they'd take care of the cartels themselves.