To defeat expected advancements in Russian and Chinese stealth detection capabilities the US may field two types of bombers by the mid-2020's.
The next generation B3 bomber under development will be a further progression of current US stealth technology. The B3 will likely be sub-sonic and smaller than the current B2 but also cheaper to build.
Hypersonic aircraft/missiles may be a better way to defeat enemy air defences than stealth aircraft, as they can strike so fast it would be nearly impossible to counter them in time. The SR-72 hypersonic reconnaissance aircraft under development will be the successor to the SR-71 Blackbird if its funding is not cut. It's being developed in parallel to the unmanned X-51 high speed strike weapon demonstrator. The SR-72 is expected to be able to reach speeds of Mach 6 from standstill and will likely have a strike capability.
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