The following is adapted from a speech delivered on April 9, 2019, at Hillsdale College’s Allan P. Kirby, Jr. Center for Constitutional Studies and Citizenship in Washington, D.C. Every headstone at Arlington tells a story. These are tales of heroes, I thought, as I placed the toe of my combat boot against the white marble. I pulled a miniature American flag out of my assault pack and pushed it three inches into the ground at my heel. I stepped aside to inspect it, making sure it met the standard that we had briefed to our troops: “vertical and perpendicular to...