GBU-38

GBU-38. The GBU-38 is a 500-pound class precision-guided munition and a primary variant of the Joint Direct Attack Munition family. It integrates a GPS-aided inertial navigation system kit onto a standard Mk 82 general-purpose bomb body, converting it into an all-weather, highly accurate smart weapon. Developed by Boeing, it entered service in the early 2000s and has seen extensive use by the United States Air Force, United States Navy, and allied forces in multiple conflicts.

Overview

The weapon is designed for tactical strikes against a wide array of targets, including fortifications, bunkers, buildings, and light armored vehicles. Its primary advantage is the ability to be employed from significant stand-off ranges and in adverse weather conditions where laser-guided bombs are ineffective. The system's guidance kit, attached to the nose and tail of the Mk 82 bomb, consists of a GPS receiver, an inertial measurement unit, and aerodynamic control surfaces. Operational deployment of the GBU-38 has been a hallmark of modern air campaigns, from Operation Enduring Freedom to the fight against the Islamic State of Iraq and the Levant.

Design and development

The development of the GBU-38 was driven by a United States Department of Defense requirement for a low-cost, all-weather precision strike capability following lessons learned from operations like Operation Desert Storm. Boeing was the prime contractor for the Joint Direct Attack Munition program under the oversight of the U.S. Air Force's Aeronautical Systems Center. The design centers on a strake kit and tail assembly that houses the guidance computer and GPS antenna, transforming existing "dumb" bomb inventories. Key testing occurred at sites like Eglin Air Force Base and the Naval Air Weapons Station China Lake, proving its integration on platforms such as the McDonnell Douglas F-15E Strike Eagle and the Lockheed Martin F-16 Fighting Falcon.

Operational history

The GBU-38 achieved initial operational capability in the early 2000s and saw immediate and extensive use in Operation Enduring Freedom in Afghanistan and Operation Iraqi Freedom. It provided coalition aircraft with a critical capability for close air support and counter-insurgency strikes with reduced collateral damage. Its use continued through operations like Operation Odyssey Dawn in Libya and the broader campaign against the Islamic State of Iraq and the Levant in Syria and Iraq. The munition has been a staple for numerous aircraft, including the Boeing B-52 Stratofortress, Lockheed Martin F-35 Lightning II, and the Panavia Tornado operated by allies like the Royal Air Force and the Italian Air Force.

Specifications

The GBU-38 uses the warhead of the standard Mk 82 bomb, which is typically filled with either Tritonal or H6 explosive, weighing approximately 500 pounds (227 kg). The complete assembly is about 74.6 inches (1.895 meters) long. Guidance is provided by a GPS/inertial navigation system (INS) with a stated accuracy of less than 5 meters CEP. The tail kit provides aerodynamic stability and maneuverability via movable fins. It is compatible with a vast array of NATO aircraft, utilizing standard bomb racks and interfaces like the MIL-STD-1760 for pre-flight programming.

Variants

Several variants and designations exist within the GBU-38 family. The basic **GBU-38(V)1/B** is the standard configuration for the U.S. Air Force. The **GBU-38(V)2/B** incorporates a hardened GPS receiver for improved anti-jamming performance. The **GBU-54 Laser JDAM** is a related variant that adds a laser seeker to the GBU-38, allowing it to engage moving targets. Other national variants have been developed for customers like the Royal Australian Air Force and the Republic of Singapore Air Force. Development of enhanced kits, sometimes in conjunction with companies like BAE Systems, continues to improve its capabilities against evolving threats.

Category:Precision-guided munitions of the United States Category:Bombs of the United States Category:Joint Direct Attack Munition