New Delhi, Sep 16: Remembering Marshal of Air Force Arjan Singh as "an outstanding soldier and a diplomat who led from the front", Congress President Sonia Gandhi on Saturday said that he will always be a source of inspiration to the Indians. Expressing her condolences, she said: "Arjan Singh was an outstanding soldier and a diplomat who led from the front. He will be particularly remembered for his successful operation tenure on the Burma Front during World War II." "He was a jewel in the throne of our Armed Forces and his extraordinary contribution to as an Air warrior would always be a source of inspiration to us," she added. Gandhi also conveyed her sympathies to his family and offered prayers for the departed. Arjan Singh died at the Army Research and Referral Hospital here on Saturday evening. He was admitted to the Intensive Care Unit (ICU) after suffering a massive heart attack in the morning.