GREETING NAVY TROOPS U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, greets servicemembers assigned to Naval Medical Research Unit in Cairo, Egypt, April 21, 2009. The research unit was founded in the 1940s after a typhus outbreak during the second world war among Egyptian dockworkers. Today, the unit is on the forefront of detecting diseases in developing countries. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 517960-W-CUS25-022.jpg Photo Gallery