The GBU-28 is a precision-guided bomb developed by the United States for use by the military. It is designed to penetrate hardened targets, such as bunkers and underground facilities, using its heavy weight and advanced guidance systems. The bomb is typically dropped from aircraft and is known for its ability to strike deep into the ground. Originally developed during the Gulf War, the GBU-28 is based on the BLU-113 bomb design and features a laser guidance system. It has a range of about 20 miles when launched from high altitudes, making it effective for long-range strikes against fortified positions.