The fund primarily directs at least 80% of its assets towards the securities comprising its benchmark index. This index is constructed to reflect the performance of short-dated U.S. Treasury debt, meaning obligations with a remaining term to maturity of less than 12 months. These "U.S. Treasury Obligations" are defined as debt instruments issued or guaranteed by the U.S. Treasury, whose principal and interest payments are fully guaranteed by the creditworthiness of the U.S. government. They encompass various forms, such as Treasury bills, notes, and bonds.