 The Pennsylvania Reserve Militia was organized as a home guard during World War I.During World War II, the entire National Guard was federalized, leaving individual states vulnerable to invasion, insurrection, natural disasters, rioting, and other emergencies which could no longer be handled by the National Guard.As a result, State Guard Act signed by President Franklin D. Roosevelt on October 21, 1940, giving individual states the option to create and maintain their own military forces independent of the federal government.