Newest edition to the Tempest Fleet, the PDB's are designed to be like PT Boats in a sense, they are small, fast, and deadly. These things are built primarily for the defense of planetary interests of the fleet. They are launched in swarms from ground based mass drivers and then climb into the atmosphere to engage a hostile fleet with their Coil/Gauss Cannon that fires a three-ton solid kinetic slug and Anti-Ship Missiles. When they are finished, they simply re-enter the atmosphere, and land vertically at the bases they came from, and are recovered and set back down on the mass driver's rails, assuming they weren't eaten alive by fighters at anytime during that battle.
Pics:
Side overview. The things under the wings are missile pods, which contains a large, anti-ship missile.
Front view, here you can see the ship's Gauss Cannon in the nose.
This is a view of the ship's flare dispensers, they help throw off heat-seekers that have made a huge comeback in recent years.
Pilot's Seat view. I conveniently figured out that I could to make a transparent HUD.
Electronics Operator's seat. The EO's have full control over the missiles and other electronic systems.
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Oh, In case your wandering how these things fly in atmosphere, lets just say it comes down to massive amounts of thrust.