Service Life Extension Program
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The Service Life Extension Program (abbreviated SLEP), is a program developed in the 1980s to extend the useful designed service life of the US Navy's aircraft carriers. The concept subsequently expanded to all of the US Navy's life-extension programs for ships, aircraft, and combat systems. The original SLEP program was canceled in 1994, before John F. Kennedy could go through it; instead, JFK was put through an 18-month Comprehensive Overhaul program. The nuclear carrier version of SLEP is RCOH (Refueling and Comprehensive Overhaul), a 36 month keel to masthead refit and overhaul of the entire ship including a refueling of all reactors.
A similar program has been used for the US Air Force's systems, such as the F118-GE-101 SLEP program which updates the powerplant for the U-2 spy plane.