B-21 Raider Stealth Bomber 
The Northrop Grumman B-21 Raider is an American heavy bomber under development by Northrop Grumman. As part of the Long Range Strike Bomber program (LRS-B), it is to be a very long-range, stealth strategic bomber for the United States Air Force capable of delivering conventional and thermonuclear weapons. The bomber is expected to enter service by 2025. It is to complement existing Rockwell B-1 Lancer, Northrop Grumman B-2 Spirit,[5] and Boeing B-52 Stratofortress bomber fleets in U.S. service and eventually replace these bombers.

A request for proposal to develop the aircraft was issued in July 2014. The Air Force initial plans were to acquire 80 to 100 LRS-B aircraft at a cost of $550 million per unit (2010) and envisions some 175 to 200 to be in service eventually.[8][9] A development contract was awarded to Northrop Grumman in October 2015. A media report states that the bomber could also be used as an intelligence gatherer, battle manager, and interceptor aircraft. At the 2016 Air Warfare Symposium, the LRS-B was formally designated "B-21", signifying the aircraft as the 21st century's first bomber. Then-Secretary of the Air Force Deborah Lee James stated that the B-21 is a fifth-generation global precision attack platform that will give the United States networked sensor-shoot capability, thus holding targets at risk. The head of the U.S. Air Force Global Strike Command expects that 100 B-21 bombers will be the minimum ordered and envisions some 175–200 bombers in service. Two internal USAF studies suggest that Air Force could increase its B-21 purchase from between 80 and 100 to as many as 145 aircraft. Initial operating capability is expected to be reached by 2030. In March 2016, the USAF announced seven tier-one suppliers for the program: Pratt & Whitney; BAE Systems of Nashua, New Hampshire; Spirit AeroSystems of Wichita, Kansas; Orbital ATK of Clearfield, Utah and Dayton, Ohio; Rockwell Collins of Cedar Rapids, Iowa; GKN Aerospace of St Louis, Missouri; and Janicki Industries of Sedro-Woolley, Washington. The F-35 program manager Chris Bogdan stated that the commonality of the B-21's engines should reduce the cost of the Pratt & Whitney F135 engine. The B-21 will be designed from the start with an open systems architecture. In April 2016, it was reported that the U.S. Air Force Global Strike Command expected the required number to increase to a minimum of 100 B-21s. In July 2016, the U.S. Air Force stated they would not release the estimated cost for the B-21 contract with Northrop Grumman. The Air Force argued releasing the cost would reveal too much information about the classified project to potential adversaries. The United States Senate Committee on Armed Services also voted to not publicly release the program's cost, restricting the information to congressional defense committees over the objections of a bipartisan group of legislators led by the committee's chairman, Senator John McCain of Arizona.[22] Senator McCain's proposed revisions to the National Defense Authorization Act for FY2017 would have reduced authorization for the B-21 program by $302 million "due to a lower than expected contract award value", while requiring "strict... program baseline and cost control thresholds", "quarterly program performance reports", and "disclosure of the engineering and manufacturing development total contract award value..." Richard E. Cole, the last living Doolittle Raider (left) announces the name of the B-21 with Air Force Secretary Deborah Lee James (right), during the Air Force Associationconference on 19 September 2016 On 19 September 2016, the B-21 was formally named "Raider" in honor of the Doolittle Raiders.[24] The last surviving Doolittle Raider, retired Lt. Col. Richard E. Cole, was present at the naming ceremony at the Air Force Association conference. The Government Accountability Office released a report on 25 October 2016 that sustained the Air Force's decision to award the LRS-B contract to Northrop Grumman. Cost was revealed to be the deciding factor in selecting Northrop Grumman over the Boeing and Lockheed Martin team. The Air Force is planning to acquire a new long-range fighter, known as "Penetrating Counter-Air", that would accompany the B-21 Raider deep into enemy territory. The new fighter, of which few details are known, would help the bomber survive enemy air defenses. Final assembly of the B-21 is expected to take place at United States Air Force Plant 42 near Palmdale, California, at the same facility used during the 1980s and 1990s for Northrop B-2 production. Northrop Grumman was awarded a $35.8 million contract modification for a large coatings facility set to be completed in 2019. Journalists touring Plant 42 reported, "while Northrop would not specify that they planned to produce the B-21 at that location, officials were all but winking and nodding at the subject." The program completed its critical design review (CDR) in December 2018. Maintenance and sustainment of the B-21 will be coordinated by Tinker Air Force Base, Oklahoma, while Edwards Air Force Base, California will lead testing and evaluation. The B-21 is expected to operate out of bases currently servicing heavy bombers, such as Dyess Air Force Base, Texas, Ellsworth Air Force Base, South Dakota, and Whiteman Air Force Base, Missouri. On 27 March 2019, Ellsworth Air Force Base was selected as the Air Force Base to host the first operational B-21 Raider bomber unit and the first formal training unit.

Being able to penetrate an enemy air defense after traveling thousands of miles from the safety of a home base is something that will prove indispensable for any country’s Air Force. And that’s exactly what the U.S. Air Force has in store for us with the B-21 Stealth Bomber. Code named the Long Range Strike Bomber (or LRS-B), the nomenclature of this bomber is still tentative, as is the struggle to even get built, which is hanging precariously in the air. The B-21 is expected to complement America’s first sleek stealth bomber, the famed B-2 Spirit, for the United States Air Force. 1.  Northrop Grumman will build the B-21
American aerospace and defense technology company, Northrop Grumman showcased the possibility of manufacturing the next generation bomber. Given their experience with the B-2 Spirit, Northrop Grumman beat out the team of Boeing and Lockheed Martin for the contract, at an estimated bid of $55 billion over the project. Northrop has now been given the go-ahead from the Pentagon to build a new fleet of elite stealth bombers to replace the Air Force’s ageing B-52’s and B-1’s. Currently, the first phase of the plan is to build 21 bombers at a cost of $511 million per aircraft which is estimated to be higher compared to the unit cost of the B-1 but lower than the B-2 Spirit. The approximate initial operating capability is in 2025, and it is being touted to be a critical part of America’s air power future. An aircraft that will allow U.S forces to come within thousands even hundreds of miles into enemy territory.

2.  The project remains highly classified
Much like the intended purpose of the aircraft, to move in secrecy and avoid detection, the project is shrouded in layers of mystery. Although official statements have been released, the details of size, number of engines, range, weight, payload and stealth capabilities remains classified. The U.S Air Force has revealed concept art of the stealth bomber, however, no prototype has been built yet and even the designation has not been decided. Exactly how close this rendering will adhere to the final design remains to be seen. The various subcontractors that will be supplying the engines, avionics and other major subsystems for the B-21 have not been disclosed to the public either. I guess we will just have to wait and see how this aircraft comes together when the time is right. Northrop Grumman did however give us a teaser of the new stealth super jet in their recent Super Bowl ad.

3.  No official designation for the aircraft yet
The U.S Air Force is currently calling this the Northrop Grumman Long Range Strike Bomber (LRS-B). The B-21 term seems to be an initial marketing attempt with the aircraft being referred to as the bomber of the 21st century, or it could be in consideration of the number of units that will be initially manufactured. Either way, the name will most likely change as the project progresses, with B-3 being the predicted designation for the LRS-B, to signify the next generation of the USAF’s modern bomber naming system that has included the B-1 and B-2. The truth is that it will be up to the Pentagon to christen this new stealth bomber as they please when the program gets underway.

4.  A New Bomber for the 21st Century
The Air Force thinks the LRS-B makes sense for America. It is similar in design to the current generation Northrop B-2 Spirit, because the Air Force chose to use technologies that have been tried and tested, and also because the B-2 is the only operational aircraft in the Pentagon’s arsenal that is able to counter low-frequency radars. The B-21 has been designed from the beginning to use existing and mature technologies in the area of area-denial and anti-access capabilities and will have a potential lifespan of half a century or longer. Once it arrives in operation, it will have an extensive and devastating series of weaponry which will help kick down invisible enemy walls, break down their defenses and create avenues for other aircraft to strike.

5.  What is the B-21 capable of?
Today, high-end defense capabilities are being developed by countries like China and Russia, which can target and shoot down aircraft from hundreds of miles away. Thus creating an impenetrable fortress thousands of miles from its territorial borders. With this in mind, the B-21 is designed to avoid detection altogether, to counter the low-frequency radars operating in the UHF and VHF bands that can track stealth aircraft. Its large flying wing design reduces low-frequency radar cross section allowing it to blend in with the background noise created by the enemy radars, much like how a submarine hides in the background noise of the ocean. Keep in mind it will not be invisible. The stealth technology will simply delay detection to give it a tactical advantage..

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