The newly unveiled Patient Evacuation Vehicle idles in front of Walter Reed Army Medical Center in Washington, D.C., June 5, 2008. One of an expected three-vehicle fleet, this PEV -- a semi-trailer-sized hospital on wheels -- will make wounded soldiers' ride to Walter Reed safer and smoother than the buses they slated are to replace. Defense Dept. photo by John J. Kruzel The newly unveiled Patient Evacuation Vehicle idles in front of Walter Reed Army Medical Center in Washington, D.C., June 5, 2008. One of an expected three-vehicle fleet, this PEV -- a semi-trailer-sized hospital on wheels -- will make wounded soldiers' ride to Walter Reed safer and smoother than the buses they slated are to replace. Defense Dept. photo by John J. Kruzel SHARE: Download: Full Size (1.24 MB) Credit: VIRIN: 151050-I-KXI10-652.jpg Photo Gallery