May 16 - Standard & Poor's Ratings Services today assigned its 'BB-' rating to Chesapeake Energy Corp.'s $4 billion senior unsecured term loan due Dec. 2, 2017. The recovery rating is '3', which indicates our expectation of meaningful recovery (50% to 70%) in the event of a default. Standard & Poor's lowered the ratings on Chesapeake on April 26, 2012, and again on May 15, 2012. The downgrades reflected a confluence of factors, including turmoil over revelations about its CEO's personal f