Tom Clancy line of demarcation

"It starts with the destruction of a US Coast Guard cutter and the loss of her entire crew. But the USCG Claiborne was on an innocuous mission to open a sea lane between an oil field off the coast of Guyana and the refineries of southern Louisiana. The destruction of the ship, tragic as it is, won't stop that mission from continuing. So who would sacrifice twenty-two men and women just to slow down the plan? That's the question plaguing Jack Ryan...