Northrop Grumman is made up of four business sectors: Aerospace Systems, Mission Systems, Technology Services, and Innovation Systems.
Northrop Grumman manufactured the B-2 Spirit
Aerospace Systems, headquartered in Redondo Beach, California produces aircraft, spacecraft, high-energy laser systems and microelectronics for the US and other nations. This includes surveillance and reconnaissance, protected communications, intelligence, battle management, strike operations, electronic warfare, and missile defense to Earth observation, space science and space exploration. The B-2 Spirit strategic bomber, the E-8C Joint STARS surveillance aircraft, the RQ-4 Global Hawk, and the T-38 Talon supersonic trainer are used by the US Air Force. The US Army uses Northrop Grumman's RQ-5 Hunter unmanned air vehicle, which has been in operational use since 1995. The U.S. Navy uses Northrop Grumman-built aerial vehicles such as the BQM-74 Chukar, RQ-4 Global Hawk based BAMS UAS, Grumman C-2 Greyhound, Grumman E-2 Hawkeye, and the EA-6B Prowler. Northrop Grumman provides major components and assemblies for different aircraft such as F/A-18 Hornet, F/A-18E/F Super Hornet and the EA-18G Growler.
Northrop Grumman Mission Systems, headquartered in Linthicum, Maryland creates military radar, sensors and related products, including C4I radar systems for air defense, Airspace Management radar systems such as AMASS, and battlefield surveillance systems like the Airborne Reconnaissance Low (ARL). Tactical aircraft sensors include the AN/APG-68 radar, the AN/APG-80 advanced agile beam fire control radar Advanced Electronically Scanned Array (AESA), and the scalable agile beam radar (SABR) AESA upgrade for the F-16 Fighting Falcon, the AN/APG-77 AESA radar for the F-22 Raptor, and the AN/APG-81 AESA radar for the F-35 Lightning II, and the AN/AAQ-37 electro-optical Distributed Aperture System (DAS) for the F-35, and the APQ-164 Passive Electronically Scanned Array (PESA) radar for the B-1 Lancer. Mission Systems produces and maintains the AWACS aerial surveillance systems for the U.S., the United Kingdom, NATO, Japan, and others. Northrop Grumman is the prime contractor for the development and integration of the Air Force's $2-billion Multi-Platform Radar Technology Insertion Program. Northrop Grumman also supports the U.S. ballistic missile program, integrates various command, control and intelligence systems and provides technical and management services to governmental and military customers, all with an emphasis on cyber security. Many other smaller products are made by Northrop Grumman, such as night vision goggles and secure communications equipment.
The Technology Services sector headquartered in McNair, Virginia (with a Herndon mailing address), works on "the entire life cycle of civil and defense platforms and capabilities through a range of services". Vinnell, a Northrop Grumman subsidiary, provides training and communications for the military. In 2003, it landed a $48 million contract to train the Iraqi Army. In 2005 the company won a $2 billion contract with Virginia to overhaul most of the state's IT operations. Later that year, The United Kingdom paid $1.2 billion in a contract with the company to provide maintenance of the country's defensive radar.
Northrop Grumman performs various functions in the War on Drugs. The company sends planes to spray herbicides on suspected cocaine fields in Colombia and opium poppy fields in Afghanistan.
On June 7, 2018, the acquisition of Orbital ATK was completed and the former company was absorbed in Northrop Grumman as a new business sector called Innovation Systems. 
Affiliated companies and partners
Remotec, a subsidiary, is a manufacturer of remote control vehicles for explosive ordnance disposal and hazardous material handling. A UK-based subsidiary, Park Air Systems, provides VHF and UHF ground-to-air communications systems for the civil and defense markets. Northrop Grumman has also worked closely with Antenna Associates, Inc., a manufacturer of Identification friend or foe (IFF)/Secondary Surveillance Radar (SSR) antennas located in Massachusetts.
In August 2007, Northrop Grumman acquired Scaled Composites in which it had previously owned a 40% stake.
In 2008, Northrop Grumman began working with DHS Systems LLC, manufacturer of the Deployable Rapid Assembly Shelter (DRASH) in New York, as part of the U.S. Army's Standard Integrated Command Post System program.