CO Boarding is a mechanic in Advance Wars: Days of Ruin where the CO boards a unit, increasing its attack, defense, and enabling the CO Zone.
Boarding a Unit[]
To board a unit the unit must spend a turn on its respective factory, airport, port or HQ. Once starting a turn on one of these buildings the unit can be selected, and a 'CO' option will appear. Boarding a unit does not cost a move for the unit and can move immediately after boarding completes.
Boarding costs half the unit's cost to complete, meaning its cost can vary from 750 War Funds to 14,000.
In battle, a CO unit's CO image is larger than usual. In this case, a War Tank with Brenner on board attacks one of Will's units.
In levels without an airport, the HQ is the only way to board onto a seaplane.
Once boarded, the CO cannot leave the unit unless it is destroyed or deleted.
Benefits of Boarding[]
Boarding a unit immediately gives the unit max veterancy, increasing it to the unique 
rank. This rank alone gives the unit an instant +20% attack and defense boost.
Boarding a unit also importantly activates the CO Zone, increasing the attack and defense of units in the zone, depending on the commander. Destroying units in this zone also allows the unit to deploy its CO Power after moving once both bars are full, at the cost of the CO unit losing its attack opportunity.
In short, the minimum stat a CO Boarded unit will be 130/130. Any bonuses after that (terrain and/or CO Zone effects) will stack after.
Units being affected by the CO unit will have a notification on the lower right of the unit info screen.
Loss of a CO Unit[]
If a CO unit is lost the CO power gauge will reset back to empty, a turn will have to pass before the CO can board another unit.
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