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In page Trident (missile):
"The first flight test of a D-5 LE subsystem, the MK 6 Mod 1 guidance system, in demonstration and shakedown operation (DASO)-23,[4] took place on USS Tennessee on 22 February 2012.[5] This was almost exactly 22 years after the first Trident II missile was launched from Tennessee in February 1990.[citation needed]
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