The US B-21 is ready for action with its advanced technology. what about the B-2?The US Air Force revealed concept art and designation for its Northrop Grumman B-21 Long Range Strike Bomber shadow last week, there are a lot of details we can now get about the new warplane. First and foremost, the new B-21 looks a lot like the the predecessor to the B-2 Spirit. In fact, the new aircraft looks remarkably similar to the original Advanced Strategic Penetration Aircraft and Advanced Technology Bomber concepts from the 1980s that eventually produced the B-2.