Is it going to use the main engines of the Vanguard? Because if it does, you should add orbital maneuvering thrusters for deorbiting. Or just give it a little bit of internal fuel. Oh and are you sure you\'re not going to put in a payload bay? You know, with the doors being decouplers? I know on reentry it\'d be a little silly looking, but this is KSP. (If you do add a payload bay, size the Vanguard up to fit a small Probodobodyne satellite.)