Mullen said he was inspired to write the essay after receiving a constant stream of legitimate, if troubling, questions while visiting U.S. military personnel around the world, including, "What if a Democrat wins?" and, "What will that do to the mission in Iraq?" "I am not suggesting that military professionals abandon all personal opinions about modern social or political issues," Mullen wrote. "What I am suggesting - indeed, what the nation expects - is that military personnel will, in the execution of the mission assigned to them, put aside their partisan leanings. Political opinions have no place in cockpit or...