China and Russia's Worst Nightmare: The B-2 Bomber Is Getting an Upgrade The B-2 fleet is undergoing a series of modernization upgrades in order to ensure the aircraft can remain at its ultimate effective capability for the next several decades. Here’s What You Need to Remember: Air Force pilots of the 1980s-era stealthy B-2 Spirit bomber plan to arm the B-2 with new weapons and upgrade the aircraft to fly the aircraft on attack missions against enemy air defenses well into the 2050s, service officials said. In coming years, the B-2 will be armed with next-generation digital nuclear weapons such as the B-61 Mod 12 with a tail kit and an Long-Range Stand-Off weapon or, LRSO, an air-launched, guided nuclear cruise missile, service officials said.