James E. Thomas, served on the Jason from 1931 until May 1932. His rate was Chief Storekeeper Second Class. At that time the Jason was the flagship of the Aircraft Squadron U.S. Asiatic Fleet. It carried planes, parts, and supplies for navy air squadrons in the Philippines and China. The Jason was scheduled to return to the United States in February 1932 for decommissioning (due to depression era military cutbacks), but her departure was delayed because of the Japanese invasion of Shanghai in January. The Jason departed Manila in April with an entire squadron of Martin torpedo bombers on her crowded deck. After a coaling stop in Hawaii at the end of April, she arrived in San Diego in mid May. The Jason was decommissioned on 30 June 1932 in Seattle.
It appears from viewing your grandfather's photos that he served aboard the Jason during the late teens and early twenties. Unfortunately of all the ships my grandfather served on, which include the battleships Arkansas and Wyoming, the Jason is the one I have the least information about. He rarely mentioned the Jason when he would talk about his adventures in China in the twenties and early-mid 30's (he was with the Asiatic Fleet aboard the USS Beaver and USS Black Hawk also). What little I know of the Jason I have gleaned from a few items he had pasted in his scrapbook, and info found on the Internet. He had no photographs taken on or of the ship.
My grandfather retired from the navy in 1949, and was manager of the Navy Exchange at the Norfolk Naval Base for many years. He died in 1976.