Commando Assault Yard

The Commando Assault Yard is a 4 x 4 x 4 decor.  Its item code is CAY.

Once this decor is built, you have to fight a certain number of times to activate it.  There is a fight meter that records your progress.  Once the decor is activated, your Land/Army units will deal extra damage for 15 minutes.  There appears to be a 24-hour cool-down before you can reactivate the decor.

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Quotes from the game:

"I've put together a squad of Commandos to train your Army Units. Use them to deal greater damage in combat now!"

"Fight {total} times to activate the Commando Assault Yard and deal greater damage with Army Units in the following fight modes: World Domination, Battle Blitz and against Neighbors."

"Note: Fights against opponents who are 11 levels or more below you will not count towards the Fight Meter."

"Once activated, the Assault Yard will let you deal more damage in all fight modes."

"The Commandos in your Assault Yard have gained enough experience to tear up the battlefield! Activate the Assault Yard now to deal greater damage with Army Units for {total} minutes."

"You work fast, Commander! For your hard work, you have {total} minutes to deal extra damage with your Army Units in combat. To the battlefield!"

"Activate the Assault Yard to begin. Note: It will be active for the next {total} minutes only. After that, you will need to keep fighting to reactivate the building."