Two U.S. Marine Corps F-18 Hornets escort a U.S. Marine Corps F-35 Lightning II aircraft as it flies toward Eglin Air Force Base, Fla., Jan. 11, 2012. The F-35 is a fifth-generation aircraft that also will be flown by the Air Force, the Navy and close U.S. allies. (DOD photo by U.S. Air Force Staff Sgt. Joely Santiago) The slideshow below has all the images of the five generations of military fighter aircraft. | 
