HONORING THE UNKNOWN U.S. Army Maj. Gen. Karl R. Horst, commanding general of Joint Forces Headquarters National Capital Region and the U.S. Army Military District of Washington, and Nicaraguan Maj. Gen. Oscar Balladares Cardoza, vice chief of defense, salute at the Tomb of the Unknowns at Arlington Cemetery, Va., July 22, 2010. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 545954-W-ZVK15-803.jpg Photo Gallery