Summary and Key Points: Steve Balestrieri, a former U.S. Army Special Forces NCO and Warrant Officer, analyzes the enduring strategic dominance of the Northrop Grumman B-2 Spirit.
-Following the successful execution of Operation Midnight Hammer in June 2025, the B-2 remains the only platform capable of delivering the GBU-57 Massive Ordnance Penetrator (MOP) to destroy deeply buried nuclear facilities in Iran.
B-2 Spirit Stealth Bomber 19FortyFive Photo. Taken by Harry J. Kazianis back in July 2025.
-This analysis details the “Spirit Realm” software factory’s role in integrating the GBU-72/B bunker-buster and open mission systems, ensuring the fleet of 19 aircraft maintains a penetrating edge against S-400 air defenses until the B-21 Raider achieves full operational capacity.
30,000 Pounds of Concrete-Busting Power: Inside the B-2 Spirit’s Exclusive GBU-57 MOP Payload
The B-2 Spirit is the U.S. Air Force’s outstanding stealth bomber. It has been in the inventory for more than 35 years, which speaks to its effectiveness.
The B-2 Spirit remains relevant through continuous modernization, including upgraded avionics, enhanced stealth coatings, and the “Spirit Realm” software factory, which accelerates mission-critical updates.
It maintains its strategic edge as the only U.S. long-range, penetrating stealth bomber capable of delivering both nuclear and conventional payloads.
However, the Air Force currently has only 19 B-2 stealth bombers, a number it likely regrets. The shortsightedness of high-ranking service and government officials has left the Air Force with a deficit in its bomber fleet.
A B-2 Spirit stealth bomber departs from Whiteman Air Force Base, Missouri, April 16, 2025. The B-2 is capable of penetrating heavily defended air spaces and delivering conventional and nuclear munitions anywhere on the globe. (U.S. Air Force photo by Senior Airman Joshua Hastings)
B-2A, serial #88-0331, ‘Spirit of South Carolina’ of the 509th Bomb Wing, Air Force Global Strike Command, on the parking ramp at Tinker Air Force Base, Oklahoma, during a visit April 11, 2017. The B-2A ‘stealth bomber’ visited the base to allow hundreds of personnel who work in direct support of the aircraft program through continuous software upgrades to see it in person and better understand the aircrafts’ role in the nation’s defense. (U.S. Air Force photo/Greg L. Davis)
B-2 Spirit Bomber. Image Credit: Creative Commons.
Initially, the plan was to build 132 B-2s; that number was later reduced to 75, and after the end of the Cold War, to 21. Since then, the number has been reduced further, with two aircraft lost in accidents.
The demand for the B-2 is going up, especially with Israel lacking the ability to penetrate the deep bunkers where Iran hid its nuclear enrichment facilities.
While the B-21 Raider will soon be taking its place in the Air Force’s bomber fleet, the B-2 is still a more than capable stealth bomber.
Software and Avionics Upgrades, The Spirit Realm
The Spirit Realm software factory enables rapid, agile software updates to enhance mission capability. Upgrades include improved beyond-line-of-sight satellite communications for better data sharing.
The B-2 Spirit’s Spirit Realm 1 release updates the 35-year-old bomber’s avionics, communications, and weapons capabilities.
It utilizes a “software factory” model to implement open mission systems, enabling faster updates, integration of advanced weapons such as the GBU-72/B bunker-buster, and improved, modern displays.
The aircraft is equipped with advanced avionics, including a multi-mode radar and terrain-following radar.
The stealth-optimized bomber relies on advanced automation to enable its two-man crew not only to complete extended missions but also to fly at all. The bomber in fact cannot be flown without computer assistance.
Stealth Technology Improvements
The aircraft continues to receive upgrades to its radar-absorbent materials, further reducing its already minimal radar cross-section to counter advanced, modern air defenses.
Coupling the B-2 Spirit’s ability to reduce acoustic, infrared, electromagnetic, visual, and radar signatures with its highly aerodynamic flying-wing design, special coatings, and composite materials creates a potent platform that is able to penetrate the most sophisticated enemy defenses and threaten high-value, heavily defended targets.
The B-2 features stealth technology that dates from the 1980s and 90s. The B-2 was built with stealth optimization merely from the front, whereas it was much more detectable from the rear. This technology is still effective, though, as seen during the B-2’s June airstrikes inside Iranian airspace.
A B-2 Spirit assigned to Whiteman Air Force Base, Mo., prepares to receive fuel from a KC-135 Stratotanker, Feb 7, 2021. A B-2 Spirit performed alongside a B-1B Lancer and a B-52 Stratofortress for the Super Bowl LV flyover on Feb. 7, 2021. (U.S. Air Force photo by Airman 1st Class David D. McLoney)
191209-N-HG846-2001 NORFOLK,Va. (Dec. 9, 2019) This poster is designed to communicate the aircraft specifications of the B2 Spirit Stealth Bomber. The B2 bomber was introduced on Jan. 1, 1997 by the Northrop Corporation.
Strategic Role With The Range To Hit Anywhere In the World:
The B-2 remains a cornerstone of the U.S. nuclear triad and a premier conventional strike weapon capable of attacking any target in the world.
The B-2 Spirit could fly to Iran from its home base in Missouri, because it has a 7,000-mile range without refueling. With one just in-flight refueling, the B-2 has a range of 10,000 nautical miles.
This intercontinental range enables it to project air power worldwide and respond to crises quickly.
The B-2 holds the record for the longest air combat mission in history. In 2001, the Spirit of America and five other B-2s were the first aircraft to enter Afghan airspace during a record-setting 44-hour mission.
The aircraft made a quick “hot pit stop” for a 45-minute crew and service change with engines still running. It then flew back to Missouri for another 30-hour flight, bringing the total to more than 70 consecutive hours.
High Payload Capacity
The B-2 Spirit can carry a maximum of 40,000 pounds of weapons, including smart bombs, bunker busters, and nuclear weapons.
This significant payload capacity allows it to carry a diverse mix of ordnance on a single mission, including up to 80 500-pound-class Mk 82 Joint Direct Attack Munition GPS-guided bombs or 16 2,400-pound B83 nuclear bombs.
B-2 Spirit stealth bombers assigned to Whiteman Air Force Base taxi and take-off during exercise Spirit Vigilance on Whiteman Air Force Base on November 7th, 2022. Routine exercises like Spirit Vigilance assure our allies and partners that Whiteman Air Force Base is ready to execute nuclear operations and global strike anytime, anywhere. (U.S. Air Force photo by Airman 1st Class Bryson Britt)
Artist image of B-2 Spirit. The B-21 Raider will look similar.
The B-2 Spirit can also carry the Air Force’s 30,000-pound GBU-57 Massive Ordnance Penetrator, a GPS-guided “bunker buster” bomb designed to destroy deeply buried, reinforced concrete targets.
Developed by Boeing for the Air Force, this 20-foot-long conventional weapon is carried exclusively by the B-2 Spirit stealth bomber and can penetrate up to 200 feet underground.
B-2s Are Still Outstanding Bombers, There Just Aren’t Enough
The B-2 is still likely the stealthiest operational bomber in the world, and will be until the B-21 Raider arrives. However, the Air Force only has 19, which isn’t nearly enough—especially if the United States in the future goes to war with China.
The low number stems from budget cuts at the end of the Cold War, and it affects the Air Forces’ ability to conduct large-scale, long-range strikes against potential adversaries such as China and Russia.
A significant air attack campaign against an advanced near-peer adversary would require a large number of attacking bombers spread across a wide combat envelope to achieve the desired effect. Russia and China are vast countries with extensive air defenses dispersed across their territories, protecting vital assets.
The B-2 Spirit is powered by four General Electric F118-GE-100 engines, each with more than 17,000 pounds of thrust. Its ceiling is 50,000 feet, and it can carry conventional or nuclear weapons.
The B-2 also serves as a testbed for technology used in the upcoming B-21 Raider, ensuring the technological base remains ahead of adversaries. The B-2 is aging, and where it was designed to beat radar defenses, the B-21 is intended to beat sensor ecosystems. The Raider is also designed to be much easier to update, so it can better keep pace with emerging threats.
About the Author: Steve Balestrieri
Steve Balestrieri is a National Security Columnist. He served as a US Army Special Forces NCO and Warrant Officer. In addition to writing on defense, he covers the NFL for PatsFans.com and is a member of the Pro Football Writers of America (PFWA). His work was regularly featured in many military publications.
