The State Street SPDR S&P Aerospace & Defense ETF seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of the S&P Aerospace & Defense Select Industry Index (the "Index")Seeks to provide exposure to the Aerospace & Defense segment of the S&P TMI, which comprises the following sub-industries: Aerospace & DefenseSeeks to track a modified equal weighted index which provides the potential for unconcentrated industry exposure across large, mid and small cap stocksAllows investors to take strategic or tactical positions at a more targeted level than traditional sector based investing