Petty Officer 3rd class Jeff Gessler watches a radar screen. Navy Petty Officer 3rd class Jeff Gessler (foreground) watches a radar screen aboard the USS Nassau (LHA 4) on Oct. 19, 2004. Gessler is going through Federal Aviation Administration certification for the military's Tactical Air Navigation system, which guides planes toward their prospective landing point by way of radio wave transmission accurately providing pilots with a distance scope to the respective airport. Gessler is assigned as an air traffic controller aboard the Nassau. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 418956-T-KGX46-148.jpg Photo Gallery