A5K is a GPS/INS-guided, next-generation penetrating weapon for striking high-priority hardened and deeply buried targets. The GBU-72 comprises the BLU-138 5,000-lb-class weapon paired with a modified JDAM tail kit. The weapon is being developed as a more survivable, lethal, and affordable replacement to the current Paveway III-based GBU-28.
A5K’s successful ground detonation test was the largest open-air “Arena” test ever conducted at Eglin, and an F-15E successfully completed the first weapon release over the Eglin Range on July 23, 2021. The drop was the first of a three flight-test series and demonstrated both safe separation from the aircraft and the JDAM tail kit’s ability to guide the weapon.
GBU-72 completed captive-carry flights on the B-1B on Oct. 31, 2023, as part of the aircraft’s external pylon testing, and USAF has discussed integration on the B-2A. GBU-72s were employed in combat striking Iranian anti-ship missile facilities near the Straits of Hormuz during Operation Epic Fury in early 2026.
GBU-72 Advanced 5,000-Pound Penetrator (A5K) Technical Data
Contractor: Air Force Armament Directorate.
First Flight: July 23, 2021.
Delivered: 2022-present.
IOC: Circa 2026 (first operational use).
Active Variant: •GBU-72. GPS/INS guided 5,000-lb BLU-138 penetrating weapon.
Guidance: Semi-active laser
Warhead: 5,000-lb (BLU-138/GBU-72) penetrating warhead.
Dimensions: N/A.
Integration: Planned: B-1B, B-2A, F-15E.