A general-purpose bomb is an air-dropped bomb intended as a compromise between blast damage, penetration, and fragmentation in explosive effect. They are designed to be effective against enemy troops, vehicles, and buildings.
American AN-M64 500 lb General Purpose Bomb as seen in Boeing B-29 Superfortress weapons bay.
A 4000 lb GP bomb, 1943
A Mk 82 GP bomb loaded on an F/A-18 Hornet, showing nose fuze and textured thermal insulation
Guidance accessories for a 500 lb body and a Laser-Guided Training Round, bottom
Joint Direct Attack Munition
The Joint Direct Attack Munition (JDAM) is a guidance kit that converts unguided bombs, or "dumb bombs", into all-weather precision-guided munitions. JDAM-equipped bombs are guided by an integrated inertial guidance system coupled to a Global Positioning System (GPS) receiver, giving them a published range of up to 15 nautical miles (28 km). JDAM-equipped bombs range from 500 to 2,000 pounds. The JDAM's guidance system was jointly developed by the United States Air Force and United States Navy, hence the "joint" in JDAM. When installed on a bomb, the JDAM kit is given a GBU identifier, superseding the Mark 80 or BLU nomenclature of the bomb to which it is attached.
U.S. Navy sailors attach a JDAM kit aboard the USS Constellation (CV-64), March 2003.
Ex-Schenectady (LST-1185) damaged by seven 2,000-pound JDAMs during USAF exercise Resultant Fury in November 2004.
JDAMs loaded under the left wing of an F-16 Fighting Falcon, with a LITENING II Targeting Pod visible beneath the fuselage
JDAMs prior to being loaded for operations over Iraq, 2003