In News:

Recent developments in the ongoing tensions involving United States and Iran have highlighted the continued relevance of traditional aerial munitions and the legal complexities of warfare at sea. The Pete Hegseth announced that the United States would shift toward the use of gravity bombs in its military operations against Iran, signalling a significant tactical adjustment in modern conflict.

What is a Gravity Bomb?

• A gravity bomb, also known as a free-fall bomb, is an unpowered aerial munition dropped from an aircraft. After release, it travels toward its target purely under the influence of gravity, with its trajectory determined by the aircraft’s speed, altitude, and release point.
• Unlike powered missiles such as the Tomahawk cruise missile, gravity bombs do not contain propulsion systems. Despite their origins in World War-era warfare, they remain widely used by the United States Air Force in conflicts including those in Iraq, Afghanistan, and Syria.

Modernisation of Gravity Bombs

Modern gravity bombs have undergone significant technological upgrades. Many are equipped with Joint Direct Attack Munition (JDAM) kits that convert conventional bombs into precision-guided munitions.

Key features of JDAM kits include:

• GPS guidance systems
• Steerable tail fins
• Improved targeting accuracy in adverse weather conditions

This modernization allows gravity bombs to combine the low cost of traditional munitions with the precision of modern guided weapons.

Major Types of Gravity Bombs Used by the US

The United States primarily deploys bombs from the Mark 80 series, which vary by size and operational purpose:

• Mk-82 (500 lb) – Used against relatively soft targets such as vehicles, troop concentrations, or radar installations.
• Mk-83 (1,000 lb) – Designed to damage reinforced structures and command centres.
• Mk-84 (2,000 lb) – A heavy bomb capable of penetrating hardened structures and bunker-type facilities.

With JDAM upgrades, these bombs can achieve high precision at relatively low cost—approximately $25,000–$30,000 per unit, making them far cheaper than advanced cruise missiles.

Operational Advantages and Limitations

Advantages

• Cost-effective compared to precision missiles
• High payload capacity
• Compatibility with precision-guidance kits

Limitations

• Aircraft must fly relatively close to the target to deploy them.
• Effective deployment generally requires air superiority and minimal air-defence threats.

Thus, gravity bombs are typically used in environments where a military has already established control of the airspace.

Legal Framework Governing Maritime Conflict

The use of military force at sea—such as attacks on ships during conflict—is regulated by international law. Key legal principles arise from the United Nations Convention on the Law of the Sea and customary international humanitarian law (IHL).

Important legal principles include:

1. Distinction: Combatants must distinguish between military targets and civilian vessels.
2. Proportionality: Attacks should avoid excessive civilian damage relative to the anticipated military advantage.
3. Military Necessity: Actions must be justified by a legitimate military objective.
4. Protection of Neutral Shipping: Ships belonging to neutral states generally enjoy protection unless directly involved in hostilities.

The San Remo Manual on International Law Applicable to Armed Conflicts at Sea (1994) also provides widely accepted guidelines on naval warfare and maritime targeting.