The Marine Corps’ top general wants an end to the monkey business that, since the start of 2012, has cast a steady, unflattering light on an institution defined in no small part by the pride it exhibits in being a disciplined, moral fighting force. “We are allowing our standards to erode,” Gen. Jim Amos, the service’s 35th commandant, laments in an internal memo distributed to all of his generals, commanding officers and sergeants major. Known as a White Letter, the sharply worded missive comes in response to “a number of recent widely publicized incidents” involving Marines misbehaving abroad. Complacent leadership…