Vince Flynn.....the next favorite author of mine. He writes the "Mitch Rapp" series. This guy is a CIA operative that works covertly and expertly for a secret department within the government. Yes, he straps! He's always got guns and weapons at the ready! He is the best CIA assassin they have...one you would definitely want on your side. He always gets the job done so that the good ole' USA is safe under his watch.
The series is packed with action and Mitch's attitude of thumbing his nose at the very bureaucratic agency he works for. I highly recommend this series, and trying it with book one, which is entitled "Transfer of Power."