New Delhi, Sep 16: Marshal of Indian Air Force Arjan Singh, who was on Saturday admitted to Army Hospital (R&R) here after a suspected massive heart attack and in a critical condition, has passed away, a defence official said. He was 98. The end came at 7.47 p.m., the official said. Prime Minister Narendra Modi, Defence Minister Nirmala Sitharaman and the three service chiefs had earlier visited the hospital's Intensive Care Unit (ICU) where he was undergoing treatment. Appointed Chief of Air Staff on August 1, 1964, Arjan Singh led the Indian Air Force effectively in the 1965 war with Pakistan, leading the air operations that pushed back the enemy offensive. He retired in 1969. In recognition of his services, he was conferred the rank of Marshal of the Air Force in January 2002, making him the first and the only 5-star rank officer with the IAF.