When the HTC Droid DNA finally hit store shelves, Verizon had pulled the plug on the official bootloader unlock method via HTC's dev tools. Since then, the folks over at Android Police and RootzWiki have of course come up with a method to unlock it. The basic idea is that you modify the device so that it appears as an unbranded one, and it can then be unlocked via the official tools from HTC.
You'll need a computer, ADB and some patience but if you're willing to spend the time you'll have an unlocked bootloader on your Droid DNA.
Source: Android Police