.TH Command UPGRADE
.NA upgrade "Update the tech of a ship/unit/plane to the current tech level"
.LV Expert
.SY "upgrade <s|l|p> <ships|land units|planes>"
The upgrade command allows a country to set the tech level
of its ships/land units/planes to the country's current tech level.
.s1
Each ship/land unit/plane to be upgraded must be at least 60%
efficient and be in one of the country's
harbors/headquarters/airports that is at least 60% efficient.
.s1
Upgrading costs 15% of the full build cost in money and avail, and
reduces the efficiency of the ship/land unit/plane by 35%.  Repairing
these 35% will then consume work and resources as usual.
.s1
.SA "build, ship, plane, land, Technology, LandUnits, Planes, Ships"