When I retired from the Army in 2013 as a three-star general, I thought that retired military officers should not make public political statements. We take an oath to uphold the Constitution of the United States, not to pledge alliance to certain political leaders. But the events of the last week have led me to reflect more deeply about what service to our country means. I can no longer remain silent because more than anything, it is a time for all citizens and leaders to stand up for our democracy. We must find ways to heal a very divided nation.