Decommissioning Explained

Decommissioning is a general term for a formal process to remove something from an active status, and may refer to:

Infrastructure

Decommissioned offshore of oilfield facilities after production has stopped, reached uneconomical levels or infrastructure is no longer maintainable or safe
Decommissioned highway of portions no longer part of the road network due to disuse or degradation
Greenfield status of former industrial sites such as brownfield no longer in use or mining sites after closure
Nuclear decommissioning after a reactor has been retired due to an accident or become inefficient and no longer meets power output demand (fuel rods eventually do get spent)

Decommissioning in Northern Ireland of paramilitary weapons
Decommissioning pennant, where a navy ship wears an extremely long commissioning pennant at the end of its commission overseas
Demobilization of soldiers
Disarmament
Ship-Submarine Recycling Program for U.S. nuclear vessels