Warden Battlefield Upgrade Kit is an upgrade kit that converts any ship in the Vanguard series into Vanguard Warden with the exception of the Vanguard Hoplite. It is a combo pack of the relevant module (to fit the center room) and the relevant items (nose, turret etc) to go with that system. For Hoplite, although it is a variant of the Vanguard Warden and does not have a module hardpoint inside to take any of the other three items, it can still mount the nose and turret items from other Vanguards however.Official Description:"These upgrade kits are specifically made for Vanguard model ships. The idea is that these battlefield upgrade kits will swap out the sub-type Vanguards gear to the BUK's gear. For instance, say I own a Vanguard Warden and I own a Harbinger BUK, when the BUK is equipped, it will change over the equipment to a Harbinger's load out.(Another analogy: think of them as like having a set of snow tires for your car. You remove your existing tires and put on the snow tires and can then switch back and forth as the situation warrants.)" Please note that those items are not yet usable in the game.