Project Indigo was started by India in 1962. An agreement was signed between India and Switzerland to develop an intermediate-range surface-to-air missile (SAM). Indigo was discontinued in later years without achieving full success. Project Indigo led to Project Devil, to develop short-range surface-to-air missile in the 1970s. Project Devil itself led to the later development of the Prithvi missile in the 1980s.[1]
The basic rocket research in the 1960s in India was done under Project Indigo. Project Indigo was an Indo-Swiss agreement to develop intermediate-range surface-to-air missiles that was scrapped when India opted for Soviet SA-2 missiles in 1962.[2]
↑Timothy V. McCarthy, "India: Emerging Missile Power," in William C. Potter and Harlan W. Jencks, eds., The International Missile Bazaar: The New Suppliers' Network, (Boulder: Westview Press Inc., 1994), p. 202.
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