Background: The F-14 entered the fleet in 1973, replacing the F-4 Phantom II. The F-14B, introduced in November 1987, incorporated new General Electric F-110 engines. In 1995, an upgrade program was initiated to incorporate new digital avionics and weapon system improvements to strengthen its multi-mission competitive edge. The F-14D, delivered in 1990, was a major upgrade with F-110 engines, new APG-71 radar system, Airborne Self Protection Jammer (ASPJ), Joint Tactical Information Distribution System (JTIDS) and Infrared Search and Track (IRST). Additionally, all F-14 variants were given precision strike capability using the LANTIRN targeting system, night vision compatibility, new defensive countermeasures systems and a new digital flight control system.