If you're interested in broad exposure to the Industrials - Aerospace & Defense segment of the equity market, look no further than the State Street SPDR S&P Aerospace & Defense ETF (XAR) , a passively managed exchange traded fund launched on September 28, 2011.Retail and institutional investors increasingly turn to passively managed ETFs because they offer low costs, transparency, flexibility, and tax efficiency; these kind of funds are also excellent vehicles for long term investors.Sector ETFs are also fu ...