Here's a cap
D5 Life Extension Program
In 2002, the United States Navy announced plans to extend the life of the submarines and the D5 missiles to the year 2040.[5] This requires a D5 Life Extension Program (D5LEP), which is currently underway. The main aim is to replace obsolete components at minimal cost[citation needed] by using commercial off the shelf (COTS) hardware; all the while maintaining the demonstrated performance of the existing Trident II missiles. In 2007, Lockheed Martin was awarded a total of $848 million in contracts to perform this and related work, which also includes upgrading the missiles' reentry systems.[6] On the same day, Draper Labs was awarded $318 million for upgrade of the guidance system.[6] Then-British Prime Minister Tony Blair was quoted as saying the issue would be fully debated in Parliament prior to a decision being taken.[7] Blair outlined plans in Parliament on 4 December 2006, to build a new generation of submarines (Dreadnought-class) to carry existing Trident missiles, and join the D5LE project to refurbish them.[8]
The first flight test of a D-5 LE subsystem, the MK 6 Mod 1 guidance system, in Demonstration and Shakedown Operation (DASO)-23,[9] took place on USS Tennessee (SSBN-734) on 22 February 2012.[10] This was almost exactly 22 years after the first Trident II missile was launched from Tennessee in February 1990.
The total cost of the Trident program thus far came to $39.546 billion in 2011, with a cost of $70 million per missile.[11]
In 2009 the United States upgraded D5 missiles with arming, fuzing and firing (AF&F) system[12][13] that allows them to target hardened silos and bunkers more accurately.