The B-2 Spirit provides the penetrating flexibility and effectiveness inherent in manned bombers. Its low-observable, or “stealth,” characteristics give it the unique ability to penetrate an enemy’s most sophisticated defenses and threaten its most valued, and heavily defended, targets. Its capability to penetrate air defenses and threaten effective retaliation provides a strong, effective deterrent and combat force well into the 21st century. B-2 Spirit (U.S. Airforce)
The B-2 PRObe is made from the same advanced aerospace material used to manufacture the B-2 Spirit, but it is not a manned bomber. The B-2 PRObe is just a probe.