A Deeper Blue by John Ringo

A Deeper Blue is the fifth and possibly final novel in this series. Mike, Kildar, Jenkins is in a self-induced drunken stupor at the start of this novel, emotionally incapacitated by the loss of a loved one in the previous book (spoiler?). Unfortunately, islamic terrorists have teamed up with drug runners in the Caribbean to attempt to import VX nerve gas to the continental US, and perpetrate a WMD attack. When the President calls, Mike won't answer, so his second in command, Adams, and some of the intel and combat teams head to Florida to work with the CIA, FBI, ATF, and all the alphabet soup you can eat to try to stop the terrorists.

When Adams and Vanner, the Kildar's intel chief, are shot in a raid that turns into a trap, Mike must rouse himself from his caravanserai and head for the States to avenge them and continue the operation. There's lots of great action on the high seas, as the Mountain Tigers take to cigarette boats to pursue the smugglers, others fast-rope onto a freighter to interrogate the crew, and Katya "Cottontail" impersonates a Girls Gone Wild coed to infiltrate the drug lord's yacht.

True to form, no surprises here. Action-packed fun for mature audiences only.