Oregon Senator Ron Wyden and a group of other senators are calling on the Federal Aviation Administration to speed up approvals for Unmanned Aerial Systems test permits in a letter sent to FAA officials Tuesday.  Wyden also wants the agency plans to regulate aircraft to be done on schedule.  The FAA created six test sites across the country to study unmanned aircraft in response to a request from Congress in 2012 to craft regulations that meet the unique safety challenges posed by UAS.   Three UAS test ranges are in Oregon:  on the Warm Springs Reservation, and outside Pendleton and Tillamook.  The agency, which is responsible for overseeing the safety of U.S. airspace, has until September 2015 to create a strategy to integrate unmanned aircraft into U.S. airspace.  Oregon Senator Jeff Merkley also signed the letter.