Tom Clancy's Ghost Recon: Choke Point by Peter Telep
When the American ambassador to Colombia is kidnapped, the Ghost Recon team battles its way through rebels to rescue the man. But during the operation, they discover evidence of a new Islamic fundamentalist group that is being backed by South American drug cartels and rebel groups.
The Ghosts follow a trail that leads them to uncover the group's true purpose: to control the choke points in the Indian Ocean and stop the flow of oil. This would mean billions to the South Americans, and cause economic chaos all over the world.
But as the team chases down their quarry, they soon realize that their true foes have yet to reveal themselves...