Defence technology, DRDO & strategic programmes

DRDO and the institutional architecture

The Defence Research and Development Organisation (DRDO) was constituted in 1958 by merging the Technical Development Establishment, the Directorate of Technical Development and Production and the Defence Science Organisation. It functions under the Department of Defence Research and Development within the Ministry of Defence and runs a network of about 50 laboratories—including the Defence Research and Development Laboratory (DRDL, Hyderabad), the Aeronautical Development Establishment (ADE, Bengaluru), the Defence Research and Development Establishment (DRDE, Gwalior, for chemical-biological defence) and the Solid State Physics Laboratory. The DRDO Chairman also serves as Secretary, Department of Defence R&D and Scientific Adviser to the Raksha Mantri.

The Integrated Guided Missile Development Programme

The Integrated Guided Missile Development Programme (IGMDP) was launched in 1983 under the leadership of Dr A.P.J. Abdul Kalam. It comprised five systems: Prithvi (surface-to-surface, short range), Agni (originally a technology demonstrator, later a family of strategic ballistic missiles), Trishul (short-range surface-to-air), Akash (medium-range surface-to-air) and Nag (anti-tank guided missile). The IGMDP was formally declared complete in 2008.

The Agni series is the backbone of India's land-based deterrent: Agni-I (~700–900 km), Agni-II (~2,000 km), Agni-III (~3,000 km), Agni-IV (~4,000 km) and Agni-V (over 5,000 km, India's first intercontinental-range missile, first tested in April 2012). Agni-V was tested with Multiple Independently targetable Re-entry Vehicle (MIRV) technology under Mission Divyastra in March 2024, giving a single missile multiple warheads on separate trajectories.

BrahMos, the world's fastest operational supersonic cruise missile (Mach ~2.8–3), is produced by BrahMos Aerospace, an India–Russia joint venture established in 1998 and named after the Brahmaputra and Moskva rivers. India delivered its first export order of BrahMos to the Philippines, with deliveries commencing in April 2024. The hypersonic next generation, BrahMos-II, is under development.

Air defence and the nuclear triad

DRDO's two-tier Ballistic Missile Defence (BMD) programme uses the Prithvi Air Defence (PAD/exo-atmospheric) and Advanced Air Defence (AAD/endo-atmospheric) interceptors. The Akash and newer QRSAM systems provide tactical air defence, while the indigenous Tejas Light Combat Aircraft (developed by ADA/HAL) entered IAF squadron service from 2016.

India's nuclear triad—land, air and sea-based delivery—was completed when INS Arihant, the indigenous nuclear-powered ballistic missile submarine, achieved its first deterrence patrol in November 2018, carrying the K-15 (Sagarika) and K-4 submarine-launched ballistic missiles. This triad operationalises India's declared No First Use posture and credible minimum deterrence doctrine.

Why this matters for the exam

Defence technology is a permanent fixture of Prelims GS factual questions and a recurring Mains GS-3 theme under the syllabus head 'achievements of Indians in science and technology; indigenisation of technology and developing new technology.' It also overlaps with GS-3 internal and external security and with GS-2 international relations (defence diplomacy, exports).

How it is tested in Prelims

Prelims rewards precise factual recall. Candidates must distinguish missile categories cold: ballistic versus cruise, surface-to-surface versus surface-to-air, the range bands of the Agni family, and which agency builds what (DRDO designs missiles; HAL and ADA build aircraft; BrahMos Aerospace is an Indo-Russian JV). The UPSC has historically asked which missiles are part of the IGMDP, the meaning of MIRV, and the distinction between Agni and Prithvi. A favoured trap pairs a system with the wrong role—e.g., calling Akash a surface-to-surface missile (it is surface-to-air). Memorise: Agni = strategic ballistic; Prithvi = tactical ballistic; BrahMos = supersonic cruise; Nag/HELINA = anti-tank; Astra = beyond-visual-range air-to-air; Pinaka = multi-barrel rocket launcher.

How it is tested in Mains

Mains demands analysis, not lists. High-yield essay angles include: (1) the indigenisation drive—the Atmanirbhar Bharat positive indigenisation lists issued by the Ministry of Defence from 2020 onwards, the increase in the FDI cap in defence to 74% via the automatic route (2020), and the corporatisation of the Ordnance Factory Board into seven Defence Public Sector Undertakings in 2021; (2) defence exports, which crossed ₹21,000 crore in FY 2023–24, with the BrahMos sale to the Philippines as the flagship case; (3) the iDEX (Innovations for Defence Excellence) scheme and the role of the Defence Acquisition Procedure 2020 in promoting 'Make in India' procurement; (4) strategic deterrence—linking the completed nuclear triad to India's No First Use doctrine.

High-yield facts to retain

• DRDO founded 1958; IGMDP launched 1983, completed 2008.
• Agni-V first tested 2012; MIRV demonstrated under Mission Divyastra, March 2024.
• INS Arihant's first deterrence patrol, November 2018, completing the triad.
• BrahMos JV with Russia, 1998; first export to Philippines, deliveries from April 2024.
• Defence FDI cap raised to 74% (automatic route), 2020; OFB corporatised into 7 DPSUs, 2021.

When the question is analytical, always anchor the answer in a named scheme, a dated milestone and a forward-looking constraint (e.g., import dependence on aero-engines, the GTRE Kaveri engine shortfall).