Military

Obviously there are bad people in the world and military forces are needed.  The U.S. spends about as much on its military as the rest of the world combined and when a hammer this large is laying around it is easy to see all problems as nails.  Have our military adventures our lives over the recent past?  Or ended up making things worse?  And what alternative use could we have made of all those expenditures, things like health care and infrastructure?