The B61-12 Life Extension Program is the U.S. modernization program that turned the B61 nuclear gravity bomb family into a single Mod 12 configuration for continued air-delivered deterrence. It mates an NNSA bomb assembly with an Air Force tail kit for guided or ballistic delivery, consolidated older B61 variants, completed its last production unit on December 18, 2024, and moved into stockpile sustainment and surveillance.
The B61-12 page is relationship-only because public sources support program, platform, and stockpile context rather than conflict-specific use.
| Element | Lead organization | Catalog relevance |
|---|---|---|
| Bomb assembly | NNSA and nuclear security enterprise sites | Refurbishes, reuses, or replaces nuclear and non-nuclear components to extend the B61 family service life. |
| Tail kit assembly | U.S. Air Force and Boeing | Adds the guided delivery path and supports all-up-round integration with certified aircraft. |
| Flight-test articles | Sandia and Air Force test organizations | Non-nuclear joint test assemblies support compatibility checks and stockpile-surveillance flights. |
Sources: NNSA completes B61-12 Life Extension Program; B61 Mod 12 LEP Tailkit Assembly Selected Acquisition Report; B61-12 system production ends, sustainment begins.
The B61-12 is a single Mod 12 configuration that official program sources describe as consolidating and replacing earlier B61 variants rather than a combat-use variant family.
| Variant | Configuration | Designation notes |
|---|---|---|
| B61-3 | Legacy B61 variant | NNSA identifies the Mod 3 as one of the older B61 variants consolidated and replaced by the B61-12 LEP. |
| B61-4 | Legacy B61 variant | Program sources describe the Mod 4 as part of the B61 set consolidated into the Mod 12. |
| B61-7 | Legacy B61 variant | NNSA lists the Mod 7 among the earlier designs consolidated and replaced by the B61-12. |
| B61-10 | Legacy B61 variant | NNSA completion material and the Air Force selected acquisition report include Mod 10 in the broader consolidation history. Sources: NNSA completes B61-12 Life Extension Program, B61 Mod 12 LEP Tailkit Assembly Selected Acquisition Report |
Official program and test sources identify both strategic bomber and dual-capable fighter aircraft for B61-12 carriage or integration testing.
| Carrier | Carrier type | Carriage evidence |
|---|---|---|
 | Stealth strategic bomber | Air Force reporting says B61-12 tail kit flight tests demonstrated compatibility with the B-2, and AFNWC later listed the B-2A among compatible aircraft. Sources: Nuclear bomb tail kit reaches major milestone for production phase, Inert nuclear gravity bomb passes first F-16 flight test |
 | Stealth strategic bomber | The DOE fact sheet identifies the B-21 as a future delivery platform for the B61-12, and AFNWC includes the B-21 in its compatible-aircraft list. Sources: B61-12 LIFE EXTENSION PROGRAM - Department of Energy, Inert nuclear gravity bomb passes first F-16 flight test |
 | Dual-role strike fighter | Sandia reported F-15E full-weapon system demonstrations at Tonopah Test Range to show B61-12 compatibility with the Strike Eagle. Sources: Flight tests show B61-12 compatible with F-15E Strike Eagle |
 | Dual-capable fighter | AFNWC reported the first F-16 flight test with an inert B61-12 and identified F-16C/D and F-16 MLU aircraft in its compatible-aircraft list. Sources: Inert nuclear gravity bomb passes first F-16 flight test |
 | Fifth-generation strike fighter | Sandia and AFNWC sources document F-35A B61-12 flight-test work, including 2020 drop testing and 2025 stockpile flight tests with joint test assemblies. Sources: Flight tests to show B61-12 will work on Air Force's newest fighter jet, B61-12 flight tests yield positive results |
 | Dual-capable strike aircraft | AFNWC lists the PA-200 among B61-12 compatible aircraft, matching the Panavia Tornado family used by NATO dual-capable aircraft operators. Sources: Inert nuclear gravity bomb passes first F-16 flight test |
The production weapon is accompanied by non-nuclear joint test assemblies used for flight testing and stockpile-surveillance work.
| Compatible item | Item type | Compatibility evidence |
|---|---|---|
 | Non-nuclear test article | Sandia describes B61-12 joint test assemblies in post-production stockpile flight tests, including F-35 sorties at Tonopah Test Range in August 2025. |
The Air Force announced Milestone C approval for the B61-12 tail kit assembly, moving that component into production qualification.
Sources: Nuclear bomb tail kit reaches major milestone for production phase
Sandia reported that full-weapon system demonstrations at Tonopah Test Range showed B61-12 compatibility with the F-15E Strike Eagle.
Sources: Flight tests show B61-12 compatible with F-15E Strike Eagle
A supersonic F-35A released a non-nuclear and mock-nuclear B61-12 test article over Tonopah Test Range.
Sources: Flight tests to show B61-12 will work on Air Force's newest fighter jet
NNSA announced completion of the B61-12 LEP first production unit, the first war reserve Mod 12 accepted for Air Force use.
Sources: NNSA completes first production unit of B61-12 Life Extension Program
NNSA completed the B61-12 LEP last production unit, closing the production phase and shifting the program toward sustainment.
Sources: NNSA completes B61-12 Life Extension Program, B61-12 system production ends, sustainment begins
Sandia says August 19-21, 2025 stockpile flight tests carried and dropped inert B61-12 joint test assemblies from F-35 aircraft.
Sources: B61-12 flight tests yield positive results
