University of Virginia ROTC cadets and midshipmen is conducting a vigil to remember prisoners of war and those missing in action. The vigil began at 3 p.m. Monday and concludes with a ceremony honoring veterans at 3:30 p.m. Tuesday in the McIntire Amphitheater on UVa Grounds. Air Force Col. R. Wyn Elder, executive assistant to the vice chairman of the joint chiefs of staff, will deliver the keynote address.