Hammerheads by Dale Brown

Hammerheads - A South American drug cartel has hooked up with an ex-Cuban officer who has built up his own army that he has based in Columbia.  The US Coast Guard is tasked with stopping drugs before they reach the US shores. In the past few weeks, several units have been attacked. Ian Hardcastle developes a plan for a new organization Whose only job is to protect the US shores from drugs.