President Obama unveiled a national security strategy on Friday that called for "strategic patience" and warned against American "overreach" -- an approach that drew criticism as some lawmakers say the rising threat from the Islamic State demands a more urgent response. The 29-page document is meant to serve as a blueprint for Obama's final two years in office. The strategy cast the U.S. as an indispensable force in combating global challenges -- including terrorism, climate change and cyber threats.