As per my knowledge the DRDO was formed in 1958 by the merger of the Technical Development Establishment and the Directorate of Technical Development and Production with the Defence Science Organisation

The Defence Research and Development Organisation is an agency of the Republic of India, charged with the military's research and development, headquartered in New Delhi, India.

Formed: 1958

Headquarters: DRDO Bhavan, New Delhi

Employees: 30,000 (7,200 scientists approximately and 12000 technical officer and assistants)
Annual budget : ₹10300 crore (US$1.5 billion)

Minister responsible
Manohar Parrikar, Defence Minister of India

Agency executive
Selvin Christopher, Secretary, Department of Defence R&D

DRDO plans:

DRDO Abhyas
DRDO AURA
DRDO Fluffy
DRDO Imperial Eagle
DRDO Kapothaka
DRDO Lakshya
DRDO Netra
DRDO Nishant
Pawan UAV
DRDO Rustom
DRDO Ulka

Address:

DRDO
Metcalfe House,
Delhi-110054
Tele: 011-23902481/87