PINSTECH had a lack of facilities to carry out these experiments in its laboratories, therefore on 25 March 1974, Abdus Salam, along with Munir Ahmad Khan and Riazuddin, visited the Pakistan Ordnance Factories (POF) where Salam held talks with Lieutenant-General Qamar Ali Mirza, where military engineers first built the Metallurgical Laboratory (ML) in Wah Cantonment in 1976. At ML, WGS developed the complex explosive 'lenses', chemical high-explosive materials, and triggering mechanisms, which was all completed in 1979. Concerns were raised with the absence of the computer numerical control (CNC) facility which was acquired in 1978. In 1979, Qureshi worked with Munir Ahmad Khan for the construction of a third nuclear pile–PARR-III– nearby at Nilore. The reactor's design process was led by Munir Ahmad Khan and Qureshi, and the Pakistan Army Corps of Engineers led the construction of the plutonium separation reactor. In 1980, the reactor west critical under Ishfaq Ahmad and attained its full power in 1981. The reactor was reprocessed at 50% efficiency, and produced the first batch of weapons grade plutonium in 1982. Directorate for Technical Development (DTD) On 11 March 1983, Qureshi and Zaman had eye-witnessed the successful 'cold' fission test, codename Kirana-I, near the Kirana Hills. Both engineers were charged with another task to form, this division was known as the Directorate for Technical Development (DTD). DTD examined the same problems as the previous WGS, this time with improvising techniques every time PAEC carried their tests. In the 1990s, DTD had carried out witnessed tests of 24 different improved designs, developed by TPG. PAEC had followed a very strict policy to develop such programmes critical to national security under extreme security. Qureshi later went on to participate in a highly clandestine missile research and development programme, under Samar Mubarakmand, in 1987. Reciprocating India's second test, Pokhran-II, in 1998, the Prime Minister of Pakistan, Nawaz Sharif, gave authorization to PAEC to carry out more nuclear tests, codename Chagai-I, in the Ras Koh area of Chagai Hills. Eventually, Qureshi participated and witnessed the first five tests of nuclear devices, evidently made from highly enriched uranium (HEU). On 30 May, PAEC carried out another test, codename Chagai-II, in the Kharan desert. It was reported to be a plutonium weapon-grade device. Legacy In 2005, Qureshi sought retirement from the Pakistan Atomic Energy Commission, and joined the mechanical engineering faculty at the Pakistan Institute of Engineering and Applied Sciences. In recognition