Description

Why In News?

Q: What is the B61-12 Life Extension Program?

The B61-12 LEP is an initiative to refurbish and extend the service life of the B61 by at least 20 years, consolidating four older variants (Mods 3, 4, 7, 10) while adding a guided tail-kit assembly for greater accuracy.

The United States is accelerating the development and fielding of the B61-13 nuclear gravity bomb, a high-yield weapon designed to penetrate hardened, deeply buried targets (bunkers).

What is Gravity Bomb Technology?

Gravity Bomb (also known as a "free-fall bomb") is a weapon delivered by aircraft that reaches its target solely through the force of gravity after release.

While the concept originated in WWI, technology has radically evolved. Transitioning from unguided munitions to precision-guided nuclear bombs like the B61-12 and B61-13.

The Technology

Modern gravity bomb technology is no longer just about explosive yield; it is about accuracy and versatility.

Digital Tail Kits: Modern bombs like the B61-12 use GPS guidance, turning free-fall weapons into precision munitions with a 30-metre accuracy range.
Dial-a-Yield: Planners can present explosive energy, such as 0.3 to 50 kilotons for the B61-12, to provide "tailored" deterrence.
Bunker Busters: The B61-13 penetrates earth or concrete to destroy hardened, deeply buried targets with downward shockwaves.

Strategic Importance in the Nuclear Triad

The Nuclear Triad consists of Land-based missiles (ICBMs), Sea-based missiles (SLBMs), and Strategic Bombers. Gravity bombs are the backbone of the air-leg.

Flexibility: Unlike missiles, aircraft carrying gravity bombs can be recalled after launch, providing a layer of "human-in-the-loop" control.
Dual-Capable Aircraft (DCA): Gravity bombs are being integrated into 5th-generation stealth fighters like the F-35A Lightning II, making it harder for enemy air defences to detect a nuclear-armed strike.

Source: ARMSCONTROL

Attempt Daily Quiz

PRACTICE QUESTION

Q. Why are militaries increasingly utilizing gravity bombs over standoff missiles for certain operations?

A) They provide a longer range of attack.

B) They are more expensive but offer higher accuracy.

C) They are cheaper and cost-effective for large-scale bombardment.

D) They do not require air superiority to be effective.

Answer: C)

Explanation: A gravity bomb costs roughly $25,000–$30,000, compared to millions for a Tomahawk missile, making them highly economical, though they require air superiority for safe delivery.

Frequently Asked Questions (FAQs)

A gravity bomb is an unguided or semi-guided weapon dropped from an aircraft. The B61 nuclear bomb is the primary U.S. thermonuclear gravity bomb and features options for free-fall, retarded free-fall (using a parachute), air burst, and ground burst deliveries

The B61-12 LEP is an initiative to refurbish and extend the service life of the B61 by at least 20 years, consolidating four older variants (Mods 3, 4, 7, 10) while adding a guided tail-kit assembly for greater accuracy.

A nuclear gravity bomb is an unpowered, air-delivered weapon dropped from strategic bombers or fighter aircraft. It relies on gravity and aerodynamics, rather than an internal propulsion system like a missile, to reach its targe