From scientific data received by PAEC, it appears that Pakistan did not test a thermonuclear device, as opposed to India. According to Ishfaq Ahmad, PAEC had no plans to develop a hydrogen device for economic reasons, even though back in 1974, Riazuddin proposed such a plan to Abdus Salam, Director of Theoretical Physics Group that time. From the outset, PAEC concentrated on developing smaller tactical nuclear weapons easily installed on Pakistan Air Force (PAF) aircraft, Pakistan Navy combatant vessels, and missiles.