DRDO BMD Phase-II Tested: AD-1, AD-2 Interceptors, ICBM-Class Shield & NASM-MR Explained

Over a 48-hour window, DRDO conducted three consecutive flight-tests from the Integrated Test Range (ITR) off the Odisha coast. Two of these validated India's multi-layered Ballistic Missile Defence (BMD) capability using two next-generation interceptors, the AD-1 and AD-2, while the third was the maiden flight of the Naval Anti-Ship Missile-Medium Range (NASM-MR). In the BMD trials, target missiles from the Agni series were launched to mimic an incoming enemy ballistic missile; land- and sea-based radars detected and tracked them, command-and-control systems computed their trajectories, and the interceptors were launched to destroy them in flight. The Ministry of Defence said all missiles were airborne simultaneously and both interceptions succeeded, demonstrating the system's ability to handle multiple targets with multiple interceptors at once.

A ballistic missile is a rocket-powered weapon that is thrust upward during a short initial "boost" phase and then follows an unpowered, arching (parabolic) trajectory governed largely by gravity, before its warhead re-enters the atmosphere and falls on the target. A cruise missile, by contrast, behaves like a small pilotless aircraft: it is powered throughout its flight, flies at lower altitudes, and can manoeuvre continuously towards its target. The key distinction for the exam is that ballistic missiles travel mostly on a fixed, predictable, high-altitude arc, which is what makes interception theoretically possible, whereas cruise missiles fly low and constantly adjust their path. India's Agni family are ballistic missiles; BrahMos is a cruise missile.

Ballistic missiles are categorised by their range. Short-Range Ballistic Missiles (SRBMs) travel relatively short distances; Medium-Range Ballistic Missiles (MRBMs) and Intermediate-Range Ballistic Missiles (IRBMs) cover progressively longer distances; and Intercontinental Ballistic Missiles (ICBMs) are the longest-range category, capable of striking targets on another continent. The exact range bands are listed in the Data Crunch section. The longer a missile's range, the higher and faster it travels in mid-course and the more rapidly its warhead descends in the terminal phase, which is precisely why intercepting ICBM-class threats is far harder than stopping shorter-range missiles, and why these tests are seen as a major leap.

Ballistic Missile Defence (BMD) is a system designed to detect, track, and destroy an incoming ballistic missile before it reaches its target. A ballistic missile's flight has three phases: the boost phase (just after launch, when the rocket motor is burning), the mid-course phase (the long coasting arc, much of it in space outside the atmosphere), and the terminal phase (the final descent towards the target inside the atmosphere). Defenders can attempt interception in different phases. Interception above the atmosphere during mid-course is called exo-atmospheric interception, while interception within the atmosphere during the terminal descent is called endo-atmospheric interception. A robust shield uses both, creating "layers": if the upper exo-atmospheric layer misses, the lower endo-atmospheric layer gets a second chance. This layered design, with overlapping radars, command-and-control centres and interceptors engaging at different altitudes, is what the term "multi-layered BMD" refers to.

India launched its BMD programme in 1998, prompted by the ballistic-missile threat in its neighbourhood, and conceived it as a two-tiered shield. Phase-I combined the Prithvi Air Defence (PAD) missile for high-altitude (exo-atmospheric) interception and the Advanced Air Defence (AAD) missile for lower-altitude (endo-atmospheric) interception, later adding the more capable Prithvi Defence Vehicle (PDV) to replace the PAD; detection relied on the Swordfish long-range tracking radar. Phase-I was designed to stop missiles of up to about 2,000 km range, and with the first PAD test in 2006 India became the fourth nation, after the United States, Russia and Israel, to develop an anti-ballistic-missile system. Phase-II, validated in the June 2026 tests, introduces the AD-1 and AD-2 interceptors to extend protection against far longer-range threats. DRDO has also initiated Phase-III, developing interceptors internally designated AD-AH and AD-AM to counter emerging threats such as hypersonic glide vehicles and MIRV-equipped missiles.

The AD-1 and AD-2 are the two interceptors of Phase-II, and together they create the multi-layered effect. The AD-1 is an endo-atmospheric interceptor: a two-stage, solid-propellant missile designed to destroy targets within the atmosphere during the terminal phase, and it can engage not only fast ballistic missiles but also slower aerial targets such as aircraft. The AD-2 is designed for interception at much higher altitudes, beyond the atmosphere, during the mid-course phase, destroying the threat in space before it can re-enter and dive on its target. Both interceptors are highly manoeuvrable and travel at hypersonic speeds of roughly Mach 6 to Mach 7. By stacking an exo-atmospheric layer (AD-2) above an endo-atmospheric layer (AD-1), India can attempt two separate interceptions of the same incoming missile, sharply raising the probability of a successful kill and extending the engagement envelope towards the 5,000 km class.

The Naval Anti-Ship Missile-Medium Range (NASM-MR) is an indigenous anti-ship missile being developed by DRDO for the Indian Navy. It is an all-weather, over-the-horizon weapon with a strike range of up to 350 km, intended to engage warships such as frigates, corvettes and destroyers. Its most important feature is sea-skimming flight: it cruises very low over the sea surface until the final moment of attack, which makes it extremely hard for enemy radars to detect and intercept. NASM-MR follows the shorter-range NASM-SR already demonstrated from naval helicopters, and is planned in ship-launched, air-launched and submarine-launched variants. For India, an indigenous medium-range anti-ship missile strengthens maritime strike power and sea-denial capability in the Indian Ocean Region, while reducing dependence on imported weapons.

A working BMD shield enhances India's strategic deterrence by protecting high-value assets, such as command centres, major cities and strategic installations, from missile attack, and it reduces an adversary's confidence that a first strike could succeed. The significance is sharpened by India's security environment: China fields one of the world's largest and most advanced ballistic-missile arsenals, including intercontinental systems, while Pakistan continues to expand and lengthen the range of its missiles. By joining the small group of nations, the United States, Russia, China and Israel, with an operational layered missile shield, India adds a defensive dimension to a deterrent posture that has so far rested mainly on offensive retaliation under its "No First Use" nuclear doctrine.

No missile shield is foolproof, and aspirants should note the limitations. Intercepting a missile is often compared to "hitting a bullet with a bullet," demanding near-perfect coordination between radars, computers and interceptors in seconds. Defences can be overwhelmed by saturation attacks (firing many missiles at once), defeated by decoys, or bypassed by newer technologies such as MIRVs (single missiles releasing multiple independently targetable warheads) and hypersonic glide vehicles that fly fast and manoeuvre unpredictably. BMD is also extremely expensive, and critics argue that deploying it can trigger an arms race, as adversaries simply build more or better missiles to overwhelm the shield, potentially undermining strategic stability. This is exactly why India's Phase-III already focuses on countering hypersonic and MIRV threats.

Maturing Phase-III: DRDO must now develop and test the next-generation AD-AH and AD-AM interceptors to counter hypersonic glide vehicles and MIRV-equipped missiles, which can defeat current-generation shields.

Moving from test to deployment: validated interceptors need to be integrated into a deployed, networked national air-and-missile-defence grid alongside systems such as the imported S-400 and the indigenous long-range air-defence programme (Project Kusha), with a decision on protecting key cities and strategic sites.

Balancing deterrence and stability: India will need to weigh the deterrent value of a missile shield against the risk of provoking a regional arms race, keeping its posture consistent with its No First Use doctrine.

Deepening indigenisation: sustaining the Atmanirbhar Bharat push in defence by scaling domestic production of interceptors, radars and anti-ship missiles such as NASM-MR through DRDO–industry partnerships.