Kildar / John Ringo.

Enhanced descriptions from Syndetics:

Problems, problems, problems! All Mike Harmon ever wanted to be was a SEAL. But after problems in the teams, college student was a decent second best. However, trouble seemed to follow him where he went. Now, after having angered every terrorist on Earth and at least five governments, buying a farm in a third world country was looking pretty good. Of course, nothing was ever simple. With Chechen terrorists knocking on the door and tenant farmers with a truly Byzantine culture, the question was whether he could drag the keldara into the 21st century before the Chechen put them back in the 6th. Kildar answers the question: Where would an international security specialist and former SEAL choose to retire-if he's going to buy the farm, it should be one with beautiful women and the best beer in the world. Valhalla on Earth complete with Vikings.