                               Command : HARDEN

 SYNTAX:
   [##:##] Command: harden <PLANES> <LEVEL>

The harden command is used to install missiles into protective silos which can
prevent  their  destruction during a nuclear or non-nuclear attack.  Each suc-
cessive harden command will add to the current hardness level of  the  missile
in question.

Each point of hardening uses one unit of  heavy  construction  materials,  and
costs $5.

Once a missile has been placed in a silo (hardened to a level greater than  0)
it can no longer be moved.

See also : launch, nuke-types, plane-types

